Dos: update them based on addons updates (#11468)

* Dos: remove mention to injected context variables

* Docs: remove "Edit on..." buttons guide

We are not showing this by default anymore. People will need to add them
manually. This is because we are not going to inject the Sphinx context anymore.

* Docs: update default versions

We not going to install `readthedocs-sphinx-ext` anymore soon.

Author: humitos

docs/user/build-default-versions.rst

@@ -10,10 +10,9 @@
 Default versions of dependencies
 ================================
 
-Read the Docs supports two tools to build your documentation:
+Read the Docs supports any documentation tool to build your documentation.
+However, we provide pre-defined builders for
 `Sphinx <https://www.sphinx-doc.org/>`__ and `MkDocs <https://www.mkdocs.org/>`__.
-In order to provide :doc:`several features </reference/features>`,
-Read the Docs injects or modifies some content while building your docs.
 
 In the past we used to install several dependencies to a specific version and update them after some time,
 but doing so would break some builds and make it more difficult for new projects to use new versions.
@@ -76,12 +75,3 @@ pillow:
 recommonmark:
   Latest version by default installed via ``conda``.
   Projects created after August 7, 2023 won't install this dependency by default.
-
-Internal dependencies
----------------------
-
-Internal dependencies are needed to integrate your docs with Read the Docs.
-We guarantee that these dependencies will work with all current supported versions of our tools,
-you don't need to specify them in your requirements.
-
-- `readthedocs-sphinx-ext <https://github.com/readthedocs/readthedocs-sphinx-ext>`__

docs/user/guides/content/index.rst

@@ -51,15 +51,10 @@ How-to guides: content, themes and SEO
     There are a number of use cases for embedding content,
     so we've built our integration in a way that enables users to build on top of it.
 
-⏩️ :doc:`Removing "Edit on ..." buttons from documentation </guides/remove-edit-buttons>`
-    When building your documentation,
-    Read the Docs automatically adds buttons at the top of your documentation and in the versions menu that point readers to your repository to make changes.
-    Here's how to remove it.
-
 ⏩️ :doc:`Adding "Edit Source" links on your Sphinx theme </guides/edit-source-links-sphinx>`
     Using your own theme?
-    Read the Docs injects some extra variables in the Sphinx ``html_context``,
-    some of which you can use to add an "edit source" link at the top of all pages.
+    Add some extra variables in the Sphinx ``html_context``,
+    to add an "edit source" link at the top of all pages.
 
 .. toctree::
    :maxdepth: 1

docs/user/guides/edit-source-links-sphinx.rst

@@ -1,9 +1,8 @@
 Adding "Edit Source" links on your Sphinx theme
 ===============================================
 
-Read the Docs injects some extra variables in the Sphinx ``html_context``
-that are used by `our Sphinx theme`_ to display "edit source" links at the top of all pages.
-You can use these variables in your own Sphinx theme as well.
+You can use define some Sphinx variables in the ``html_context`` to tell Read the Docs Sphinx theme
+to display "Edit Source" links on each page.
 
 More information can be found on `Sphinx documentation`_.