[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#2068

content/applications/finance/accounting/fiscal_localizations/localizations/indonesia.rst

@@ -25,7 +25,7 @@ NPWP/NIK settings
     field on the customer's contact to set the NPWP needed to generate the e-Faktur file. If your
     customer does not have an NPWP, just enter the NIK in the same VAT field.
 
-  .. image:: media/indonesia-partner-nik.png
+  .. image:: indonesia/indonesia-partner-nik.png
      :align: center
 
 .. _localization_indonesia/e-faktur_usage:
@@ -49,7 +49,7 @@ Generate Tax Invoice Serial Number
    number, as requested by the Indonesia Tax Revenue Department.
 #. There is a counter to inform you how many unused numbers are left in that group.
 
-   .. image:: media/indonesia-sn-count.png
+   .. image:: indonesia/indonesia-sn-count.png
       :align: center
 
 .. _localization_indonesia/csv:
@@ -63,7 +63,7 @@ Generate e-faktur csv for a single invoice or a batch invoices
 #. Set a Kode Transaksi for the e-Faktur. There are constraints related to the Kode transaksi and
    the type of VAT applied to invoice lines.
 
-   .. image:: media/indonesia-kode-transaksi.png
+   .. image:: indonesia/indonesia-kode-transaksi.png
       :align: center
 
 #. Odoo will automatically pick the next available serial number from the e-Faktur number table (see
@@ -71,13 +71,13 @@ Generate e-faktur csv for a single invoice or a batch invoices
    number as a concatenation of Kode Transaksi and serial number. You can see this from the invoice
    form view under the page *Extra Info* in the box *Electronic Tax*.
 
-   .. image:: media/indonesia-e-faktur-sn.png
+   .. image:: indonesia/indonesia-e-faktur-sn.png
       :align: center
 
 #. Once the invoice is posted, you can generate and download the e-Faktur from the *Action* menu
    item *Download e-faktur*. The checkbox *CSV created* will be set.
 
-   .. image:: media/indonesia-csv-created.png
+   .. image:: indonesia/indonesia-csv-created.png
       :align: center
 
 #. You can select multiple invoices in list view and generate a batch e-Faktur .csv.
@@ -110,7 +110,7 @@ Correct an invoice that has been posted and downloaded: Replace Invoice feature
    replaced invoice replacing the third digit of the original serial number with *1* (as requested
    to upload a replacement invoice in the e-Faktur app).
 
-.. image:: media/indonesia-replace-invoice.png
+.. image:: indonesia/indonesia-replace-invoice.png
    :align: center
 
 
@@ -124,5 +124,5 @@ Correct an invoice that has been posted but not downloaded yet: Reset e-Faktur
 #. The serial number will be unassigned, and we will be able to reset the invoice to draft, edit it
    and re-assign a new serial number.
 
-.. image:: media/indonesia-e-faktur-reset.png
+.. image:: indonesia/indonesia-e-faktur-reset.png
    :align: center