[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/administration/odoo_sh/getting_started/create.rst

@@ -10,7 +10,7 @@ Deploy your platform
 
 Go to `Odoo.sh <https://www.odoo.sh/>`_ and hit the *Deploy your platform* button.
 
-.. image:: ./media/deploy.png
+.. image:: create/deploy.png
    :align: center
 
 Sign in with Github
@@ -18,7 +18,7 @@ Sign in with Github
 
 Sign in with your Github account. If you do not have an account yet, hit the *Create an account* link.
 
-.. image:: ./media/github-signin.png
+.. image:: create/github-signin.png
    :align: center
 
 Authorize Odoo.sh
@@ -26,7 +26,7 @@ Authorize Odoo.sh
 
 Grant Odoo.sh the required accesses to your account by clicking the *Authorize* button.
 
-.. image:: ./media/github-authorize.png
+.. image:: create/github-authorize.png
    :align: center
 
 Odoo.sh basically needs:
@@ -62,7 +62,7 @@ When submitting the form, if you are notified your subscription is not valid, it
 
 In case of doubt with your subscription, please contact the `Odoo support <https://www.odoo.com/help>`_.
 
-.. image:: ./media/deploy-form.png
+.. image:: create/deploy-form.png
    :align: center
 
 You're done !
@@ -70,7 +70,7 @@ You're done !
 
 You can start using Odoo.sh. Your first build is about to be created. You will soon be able to connect to your first database.
 
-.. image:: ./media/deploy-done.png
+.. image:: create/deploy-done.png
    :align: center
 
 .. _odoo_sh_import_your_database:
@@ -113,12 +113,12 @@ Access the URL :file:`/web/database/manager` of your on-premise database and dow
 
 You will need the master password of your database server. If you do not have it, contact your system administrator.
 
-.. image:: ./media/create-import-onpremise-backup.png
+.. image:: create/create-import-onpremise-backup.png
    :align: center
 
 Choose a zip including the filestore as the backup format.
 
-.. image:: ./media/create-import-onpremise-backup-dialog.png
+.. image:: create/create-import-onpremise-backup-dialog.png
   :align: center
 
 Odoo Online databases
@@ -126,7 +126,7 @@ Odoo Online databases
 
 `Access your databases manager <https://accounts.odoo.com/my/databases/manage>`_ and download a backup of your database.
 
-.. image:: ./media/create-import-online-backup.png
+.. image:: create/create-import-online-backup.png
   :align: center
 
 .. Warning::
@@ -138,12 +138,12 @@ Upload the backup
 
 Then, in your Odoo.sh project, in the backups tab of your production branch, import the backup you just downloaded.
 
-.. image:: ./media/create-import-production.png
+.. image:: create/create-import-production.png
    :align: center
 
 Once the backup imported, you can access the database using the *Connect* button in the history of the branch.
 
-.. image:: ./media/create-import-production-done.png
+.. image:: create/create-import-production-done.png
   :align: center
 
 Check your outgoing email servers