Add caution message that this is outdated documentation

And further cleanup intro text which is outdated.

conf.py

@@ -273,18 +273,3 @@ if is_i18n and os.path.exists("../classes/" + language):
         shutil.rmtree("classes")
 
     os.symlink("../classes/" + language, "classes")
-
-# Couldn't find a way to retrieve variables nor do advanced string
-# concat from reST, so had to hardcode this in the "epilog" added to
-# all pages. This is used in index.rst to display the Weblate badge.
-# On English pages, the badge points to the language-neutral engage page.
-rst_epilog = """
-.. |weblate_widget| image:: https://hosted.weblate.org/widgets/godot-engine/{image_locale}/godot-docs/287x66-white.png
-    :alt: Translation status
-    :target: https://hosted.weblate.org/engage/godot-engine{target_locale}/?utm_source=widget
-    :width: 287
-    :height: 66
-""".format(
-    image_locale="-" if language == "en" else language,
-    target_locale="" if language == "en" else "/" + language,
-)

index.rst

@@ -1,26 +1,15 @@
 Godot Docs – *3.4* branch
 =========================
 
-.. only:: not i18n
+.. caution::
 
-  .. note:: Godot's documentation is available in various languages and versions.
+    This is the documentation for Godot 3.4, released in 2021. This version
-            Expand the "Read the Docs" panel at the bottom of the sidebar to see
+    is no longer supported, but its documentation is still available for
-            the list.
+    reference.
 
-.. only:: i18n
+    Please refer to the `stable <https://docs.godotengine.org/en/stable>`_
-
+    and `latest <https://docs.godotengine.org/en/latest>`_ branches of the
-  .. note:: This documentation is translated from the `original English one
+    documentation for up-to-date information.
-            <https://docs.godotengine.org/en/latest>`_ by community members
-            on `Weblate <https://hosted.weblate.org/projects/godot-engine/godot-docs>`_.
-
-            Depending on the translation effort's completion level, you may
-            find paragraphs or whole pages which are still in English. You can
-            help the community by providing new translations or reviewing existing
-            ones on Weblate.
-
-            For the time being, localized translations are only available for
-            the "latest" (development) branch, but should be suitable to learn
-            how to use stable Godot releases nevertheless.
 
 Welcome to the official documentation of `Godot Engine <https://godotengine.org>`__,
 the free and open source community-driven 2D and 3D game engine! If you are new
@@ -32,27 +21,6 @@ The table of contents below and in the sidebar should let you easily access the
 documentation for your topic of interest. You can also use the search function
 in the top left corner.
 
-You can also `download an HTML copy <https://nightly.link/godotengine/godot-docs/workflows/build_offline_docs/master/godot-docs-html-stable.zip>`__
-for offline reading (updated every Monday). Extract the ZIP archive then open
-the top-level ``index.html`` in a web browser.
-
-.. note:: Godot Engine is an open source project developed by a community of
-          volunteers. The documentation team can always use your
-          feedback and help to improve the tutorials and class reference. If
-          you don't understand something, or cannot find what you
-          are looking for in the docs, help us make the documentation better
-          by letting us know!
-
-          Submit an issue or pull request on the `GitHub repository
-          <https://github.com/godotengine/godot-docs/issues>`_,
-          help us `translate the documentation
-          <https://hosted.weblate.org/engage/godot-engine/>`_ into your
-          language, or talk to us on the
-          ``#documentation`` channel on the `Godot Contributors Chat
-          <https://chat.godotengine.org/>`_!
-
-.. centered:: |weblate_widget|
-
 The main documentation for the site is organized into the following sections:
 
 .. toctree::