[REF] install: move intro to main install page and split by install type

This PR moves the introduction about the different installation methods and editions found on the
install/install.rst page directly under the main install/ page. It creates three pages, one per
installation method documented on the install/install.rst page (Docker being documented on
docker.com and maintained by us), and moves the related content there. In addition, it fixes various
typos/grammar issues and improves the content according to the documentation guidelines. Various
references and links across the documentation had to be fixed accordingly.

task-3459070

closes odoo/documentation#5538

X-original-commit: da2a48b9fd
Signed-off-by: Xavier Platteau (xpl) <xpl@odoo.com>

content/developer/howtos/website_themes/setup.rst

@@ -12,8 +12,9 @@ In this chapter, you will learn:
 Install
 =======
 
-There are multiple ways to :doc:`install Odoo <../../../administration/install/install>`, depending on the intended use case. This documentation
-assumes you use the :ref:`source install <setup/install/source>` (running Odoo from the source code), which is best suited
+There are multiple ways to :doc:`install Odoo <../../../administration/install>`, depending on the
+intended use case. This documentation assumes you use the :doc:`source install
+<../../../administration/install/source>` (running Odoo from the source code), which is best suited
 for Odoo designers and developers.
 
 Databases
@@ -181,7 +182,7 @@ Running Odoo
 Once all dependencies are set up, Odoo can be launched by running `odoo-bin`, the command-line
 interface of the server. It is located at the root of the Odoo Community directory.
 
-- :ref:`Running Odoo <setup/install/source/running_odoo>`
+- :ref:`Running Odoo <install/source/running_odoo>`
 - `Docker <https://hub.docker.com/_/odoo/>`_
 
 To configure the server, you can specify command-line arguments or a configuration file. The first

content/developer/reference/cli.rst

@@ -12,10 +12,10 @@ environment <reference/cmdline/shell>`, :ref:`scaffold an Odoo module <reference
 
 .. important::
    The command to use to call the CLI depends on how you installed Odoo. In the examples below, we
-   assume that you are :ref:`running Odoo from source <setup/install/source>` with the
-   :file:`odoo-bin` file. If you installed Odoo :ref:`from a distribution package
-   <setup/install/packaged>` or :ref:`with Docker <setup/install/docker>`, you must adapt the
-   command.
+   assume that you are :doc:`running Odoo from source <../../administration/install/source>` with
+   the :file:`odoo-bin` file. If you installed Odoo :doc:`from a distribution package
+   <../../administration/install/packages>` or with `Docker <https://hub.docker.com/_/odoo/>`_, you
+   must adapt the command.
 
    .. tabs::
 

content/developer/tutorials/backend.rst

@@ -11,7 +11,7 @@ Building a Module
    This tutorial is outdated. We recommend reading :doc:`getting_started` instead.
 
 .. warning::
-   This tutorial requires :ref:`having installed Odoo <setup/install>`
+   This tutorial requires :doc:`having installed Odoo <../../administration/install>`
 
 Start/Stop the Odoo server
 ==========================
@@ -970,8 +970,8 @@ Gantt
 -----
 
 .. warning::
-   The gantt view requires the web_gantt module which is present in :ref:`the enterprise edition
-   <setup/install/editions>` version.
+   The gantt view requires the web_gantt module which is present in the enterprise edition
+   <install/editions>` version.
 
 Horizontal bar charts typically used to show project planning and advancement,
 their root element is ``<gantt>``.

content/developer/tutorials/web.rst

@@ -24,7 +24,7 @@ or extend existing business systems of Odoo, see :doc:`backend`.
     * jQuery_
     * `Underscore.js`_
 
-    It also requires :ref:`an installed Odoo <setup/install>`, and Git_.
+    It also requires :doc:`an installed Odoo <../../administration/install>`, and Git_.
 
 A Simple Module
 ===============

content/developer/tutorials/website.rst

@@ -11,7 +11,7 @@ Building a Website
 
     * This guide assumes `basic knowledge of Python
       <http://docs.python.org/2/tutorial/>`_
-    * This guide assumes :ref:`an installed Odoo <setup/install>`
+    * This guide assumes :doc:`an installed Odoo <../../administration/install>`
 
 Creating a basic module
 =======================