Adapt current doc into new doc

Author: nmarotte

content/administration.rst

@@ -18,5 +18,4 @@ These guides provide instructions on how to install, maintain and upgrade Odoo d
 
     administration/install
     administration/maintain
-    administration/upgrade
     administration/odoo_sh

content/administration/maintain/supported_versions.rst

@@ -12,7 +12,7 @@ Odoo provides support and bug fixing **for the 3 last major versions** of Odoo.
    <odoo_online>` hosting every two months. Odoo Online users can then benefit from the latest
    features of Odoo.
 
-   - Admins of Odoo Online databases are invited to :doc:`upgrade <../upgrade>` them regularly.
+   - Admins of Odoo Online databases are invited to :doc:`upgrade </upgrade>` them regularly.
    - Online versions are *not* released for Odoo.sh and On-Premise installations.
    - Online versions are listed below as *SaaS*.
 

content/administration/upgrade.rst

@@ -32,11 +32,11 @@ Odoo is compliant with the **Egyptian Tax Authority (ETA) e-invoicing** requirem
 
 .. important::
    Egyptian e-invoicing is available from Odoo 15.0. If needed, :doc:`upgrade
-   </administration/upgrade>` your database.
+   </upgrade>` your database.
 
 .. seealso::
    - `Video: Egypt E-invoicing <https://www.youtube.com/watch?v=NXuBPLR4pVw>`_
-   - :doc:`/administration/upgrade`
+   - :doc:`/upgrade`
 
 .. _egypt/e-invoicing-eta-portal:
 

content/applications/finance/fiscal_localizations/egypt.rst

@@ -25,7 +25,7 @@ An upgrade does not cover:
 .. note:: |assistance-contact|
 
 .. seealso::
-   - :ref:`upgrade/sla`
+   - :doc:`/upgrade/sla`
 
 .. toctree::
 
@@ -35,3 +35,5 @@ An upgrade does not cover:
     upgrade/full_process
     upgrade/request
     upgrade/advanced
+    upgrade/faq
+    upgrade/sla

content/upgrade.rst

@@ -7,15 +7,7 @@
 FAQ
 ===
 
-.. _upgrade-faq/why:
-
-Why upgrade
-===========
-
-* You benefit from the latest features of the :ref:`new major version
-  <upgrade-faq/release-notes>` released by Odoo.
-* If you are in an :ref:`unsupported version <upgrade/supported-versions>`, you get a new version
-  with support.
+TODO merge FAQ into sections
 
 .. _upgrade-faq/when: