[MOV] content/*: move resource files into their related page's directory

Since odoo/documentation#903, the guideline for the location of new
resource (images, downloadable files, RST includes...) files is to place
those inside the directory of the RST page that references them.

For example, if `doc1.rst` has a reference to `image.png` and to
`download.zip`, the file structure should look like this:

├── parent_doc/
│     └── doc1/
│     │     └── image.png
│     │     └── download.zip
│     └── doc1.rst
│     └── doc2.rst
├── parent_doc.rst

Before this commit, most of the resource files were still located inside
'media' directories holding all the resource files referenced by RST
pages located at the same level as these directories. In the example
above, a single 'media' directory would hold all the resource files
referenced by both `doc1.rst` and `doc2.rst`. Doing so prevented us from
figuring out easily which resource file was referenced by which RST page
and, thus, lead to unused resource files piling up in the repository. It
also made it more complicated to define codeowners regex rules because a
team could not simply be assigned to `/some_page.*` but needed to be
assigned to both `/some_page\.rst` and to the location of 'media'.

In order to help new content writers figure out the guideline when
taking examples from other RST pages, this commit retroactively applies
the guideline to existing resource files and 'media' directories. The
left-over resource files that are not referenced by any RST page are
removed.

task-2497965

Part-of: odoo/documentation#2066

content/applications/productivity/iot/config/connect.rst

@@ -4,17 +4,17 @@ Connect an IoT Box to your database
 
 Install the Internet of Things (IoT) App on your Odoo Database.
 
-.. image:: media/connect01.png
+.. image:: connect/connect01.png
    :align: center
 
 Go in the IoT App and click on Connect on the IoT Boxes page.
 
-.. image:: media/connect02.png
+.. image:: connect/connect02.png
    :align: center
 
 Follow the steps to connect your IoT Box.
 
-.. image:: media/connect03.png
+.. image:: connect/connect03.png
    :align: center
 
 Ethernet Connection
@@ -27,7 +27,7 @@ Ethernet Connection
 
 3. Read the Pairing Code from a screen or a receipt printer connected to the IoT Box.
 
-   .. image:: media/connect04.png
+   .. image:: connect/connect04.png
 
 4. Input the Pairing Code and click on the Pair button.
 
@@ -43,18 +43,18 @@ WiFi Connection
 
 2. Copy the token
 
-   .. image:: media/connect05.png
+   .. image:: connect/connect05.png
 
 3. Connect to the IoT Box WiFi Network (make sure there is no ethernet
    cable plugged in your computer).
 
-   .. image:: media/connect06.png
+   .. image:: connect/connect06.png
 
 4. You will be redirected to the IoT Box Homepage (if it doesn't work,
    connect to the IP address of the box). Give a name to your IoT Box (not
    required) and paste the token, then click on next.
 
-   .. image:: media/connect07.png
+   .. image:: connect/connect07.png
 
    .. tip::
       If you are on Runbot, do not forget to add the -all or -base in the
@@ -67,15 +67,15 @@ WiFi Connection
    if there is one) and click on Submit. Wait a few seconds before being
    redirected to your database.
 
-   .. image:: media/connect08.png
+   .. image:: connect/connect08.png
 
 You should now see the IoT Box.
 
-.. image:: media/connect09.png
+.. image:: connect/connect09.png
    :align: center
 
 IoT Box Schema
 ~~~~~~~~~~~~~~
 
-.. image:: media/connect10.png
+.. image:: connect/connect10.png
    :align: center

content/applications/productivity/iot/config/flash_sdcard.rst

@@ -18,7 +18,7 @@ will be saved.
    This process can take more than 30 minutes. Do not turn off or unplug
    the IoT Box as it would leave it in an inconsistent state. 
 
-.. image:: media/flash_sdcard01.png
+.. image:: flash_sdcard/flash_sdcard01.png
    :align: center
 
 Upgrade with Etcher
@@ -33,5 +33,5 @@ Then, open *Etcher* and select *Flash from file*, find the image you just
 downloaded. Insert the IoT Box SD card into your computer and select it.
 Click on *Flash* and wait for the process to finish.
 
-.. image:: media/flash_sdcard02.png
+.. image:: flash_sdcard/flash_sdcard02.png
    :align: center

content/applications/productivity/iot/config/pos.rst

@@ -2,7 +2,7 @@
 Use the IoT Box for the PoS
 ===========================
 
-.. image:: media/pos01.png
+.. image:: pos/pos01.png
     :align: center
 
 Prerequisites
@@ -62,7 +62,7 @@ Once it's done, you can connect the IoT Box to your PoS. For this, go in
 and select the devices you want to use in this Point of Sale. Save the
 changes.
 
-.. image:: media/pos02.png
+.. image:: pos/pos02.png
     :align: center
 
 Set up is done, you can launch a new PoS Session.

content/applications/productivity/iot/config/troubleshooting.rst

@@ -54,7 +54,7 @@ My printer is not detected
 If one of your printers doesn't show up in your devices list, go to the
 IoT Box homepage and make sure that it is listed under *Printers*.
 
-.. image:: media/troubleshooting_printer_01.png
+.. image:: troubleshooting/troubleshooting_printer_01.png
    :align: center
 
 If your printer is not present on the IoT Box homepage, hit
@@ -76,7 +76,7 @@ tab and select the printer in the list. In the Administration dropdown,
 click on *Modify Printer*. Follow the steps and select the Make and Model
 corresponding to your printer.
 
-.. image:: media/troubleshooting_printer_02.png
+.. image:: troubleshooting/troubleshooting_printer_02.png
    :align: center
 
 .. note::
@@ -121,7 +121,7 @@ recognized by the IoT Box.
 You can manually change the device type by going to its form view and
 activating the *Is scanner* option.
 
-.. image:: media/troubleshooting_barcode_01.png
+.. image:: troubleshooting/troubleshooting_barcode_01.png
    :align: center
 
 Cashdrawer

content/applications/productivity/iot/devices/camera.rst

@@ -18,7 +18,7 @@ If your camera is a `*supported
 one* <https://www.odoo.com/page/iot-hardware>`__, there is no need to
 set up anything as it will be detected as soon as it is connected.
 
-.. image:: media/camera_01.png
+.. image:: camera/camera_01.png
    :align: center
 
 Link a Camera to a Quality Control Point
@@ -34,12 +34,12 @@ and open the control point you want to link with the camera.
 Now, you can edit the control point and select the device from the
 dropdown list. Now, hit save.
 
-.. image:: media/camera_03.png
+.. image:: camera/camera_03.png
    :align: center
 
 Then, your camera can be used with the picked *Control Point*. During
 the manufacturing process, reaching the *Quality Control Point* you
 chose before will allow you to take a picture.
 
-.. image:: media/camera_04.png
+.. image:: camera/camera_04.png
    :align: center

content/applications/productivity/iot/devices/footswitch.rst

@@ -19,7 +19,7 @@ If your footswitch is a `supported
 one <https://www.odoo.com/page/iot-hardware>`__, there is no need to
 set up anything since it will be automatically detected when connected.
 
-.. image:: media/footswitch_01.png
+.. image:: footswitch/footswitch_01.png
    :align: center
 
 Link a Footswitch to a Workcenter
@@ -30,7 +30,7 @@ workcenter. Go to the workcenter you want to use the footswitch in and
 add the device in the *IoT Triggers* tab. Then, you can link it to an
 action and also add a key to trigger it.
 
-.. image:: media/footswitch_03.png
+.. image:: footswitch/footswitch_03.png
    :align: center
 
 Note that the one that is first in the list will be chosen. So, the

content/applications/productivity/iot/devices/measurement_tool.rst

@@ -12,7 +12,7 @@ Connect in USB
 To add a device connected by USB, just plug the USB cable in the *IoT
 Box*, and the device should appear in your Odoo database.
 
-.. image:: media/measurement_tool_01.png
+.. image:: measurement_tool/measurement_tool_01.png
    :align: center
 
 Connect in Bluetooth
@@ -24,7 +24,7 @@ to the device.
 
 Here is an example of what it should look like:
 
-.. image:: media/measurement_tool_03.png
+.. image:: measurement_tool/measurement_tool_03.png
    :align: center
 
 Link a measurement tool to a quality control point
@@ -41,12 +41,12 @@ assign a measurement tool.
 Now, you can edit the control point and choose the device from the
 dropdown list. Then, hit save.
 
-.. image:: media/measurement_tool_04.png
+.. image:: measurement_tool/measurement_tool_04.png
    :align: center
 
 Now, your measurement tool is linked to the chosen *Control Point*.
 The value, which needs to be changed manually, will be automatically
 updated while the tool is being used.
 
-.. image:: media/measurement_tool_05.png
+.. image:: measurement_tool/measurement_tool_05.png
    :align: center

content/applications/productivity/iot/devices/printer.rst

@@ -17,7 +17,7 @@ detected automatically and will appear in the *Devices* list of your IoT app.
 .. note::
          The printer can take up to two minutes to appear in your devices list.
 
-.. image:: media/printer_01.png
+.. image:: printer/printer_01.png
    :align: center
 
 Link the Printer
@@ -34,13 +34,13 @@ To do so, you need to create a *Quality Control Point* from the
 operation and the work order operation. In type, choose *Print Label*
 and hit save.
 
-.. image:: media/printer_03.png
+.. image:: printer/printer_03.png
    :align: center
 
 Now, each time you reach the quality control point for the chosen
 product, a *Print Label* button will appear.
 
-.. image:: media/printer_04.png
+.. image:: printer/printer_04.png
    :align: center
 
 To Reports
@@ -50,19 +50,19 @@ You can also link a type of report to a certain printer. In the *IoT*
 app, go to the *Devices* menu and select the printer you want to set
 up.
 
-.. image:: media/printer_05.png
+.. image:: printer/printer_05.png
    :align: center
 
 Now, go to the *Printer Reports* tab.
 
-.. image:: media/printer_06.png
+.. image:: printer/printer_06.png
    :align: center
 
 Hit edit and then, click on *Add a line*. In the window that shows up,
 check all the types of reports that should be linked to this printer.
 Click on select and save.
 
-.. image:: media/printer_07.png
+.. image:: printer/printer_07.png
    :align: center
 
 Now, each time you click on *Print* in the control panel, instead of
@@ -80,7 +80,7 @@ Doing so is really easy. Go to your *Point of Sale* app and open your
 and check the *IoT Box* feature. Then, choose your *Receipt Printer*
 from the dropdown.
 
-.. image:: media/printer_08.png
+.. image:: printer/printer_08.png
    :align: center
 
 Now, you will be able to print different kinds of tickets from your *POS*:
@@ -93,14 +93,14 @@ Sales details can be printed by clicking on the printer icon on the
 navbar at the top of the *PoS*. It will print the details of the sales
 of the current day.
 
-.. image:: media/printer_09.png
+.. image:: printer/printer_09.png
    :align: center
 
 As for the bill, it is only available in restaurant mode. In your
 restaurant settings, activate *Print Bills* and a *Bill* button will
 appear in the left panel of the *PoS*.
 
-.. image:: media/printer_10.png
+.. image:: printer/printer_10.png
    :align: center
 
 Print Orders in the kitchen
@@ -111,14 +111,14 @@ In restaurant mode, you can send order tickets to the kitchen.
 To do so, go to the *PoS* app and open your *PoS* settings. Then,
 tick *Order Printer*.
 
-.. image:: media/printer_11.png
+.. image:: printer/printer_11.png
    :align: center
 
 Now, go to the *Printers* menu. Hit create, select the printer from
 the dropdown and, in the *Printer Product Categories* field, choose
 all the categories of products that should be printed on this printer.
 
-.. image:: media/printer_12.png
+.. image:: printer/printer_12.png
    :align: center
 
 In the *PoS*, when you add or remove a product from one of the