feat!: Move the docs out of the guides subdirectory.

Now that the content in `guides` is all of the edx-platform docs, move
them all into the top-level docs directory to reduce confusion.

BREAKING CHANGE: Guides are now just docs.  This will require updating
the publishing settings so that RTD looks for the conf in a different
location.

docs/references/docstrings/cms_index.rst

@@ -0,0 +1,14 @@
+cms
+***
+
+The ``cms`` (course management system) directory in edx-platform is home to
+the code needed for the Course Authoring Studio which is not also needed for
+the LMS.
+
+.. toctree::
+    :maxdepth: 2
+
+    cms/modules
+    cms/djangoapps/contentstore/modules
+    cms/djangoapps/course_creators/modules
+    cms/djangoapps/xblock_config/modules

docs/references/docstrings/common_djangoapps.rst

@@ -0,0 +1,23 @@
+common/djangoapps
+*****************
+
+This directory contains Django applications intended to be used in both the
+LMS and Studio.
+
+.. toctree::
+    :maxdepth: 2
+
+    common/djangoapps/course_action_state/modules
+    common/djangoapps/course_modes/modules
+    common/djangoapps/database_fixups/modules
+    common/djangoapps/edxmako/modules
+    common/djangoapps/enrollment/modules
+    common/djangoapps/entitlements/modules
+    common/djangoapps/pipeline_mako/modules
+    common/djangoapps/static_replace/modules
+    common/djangoapps/status/modules
+    common/djangoapps/student/modules
+    common/djangoapps/third_party_auth/modules
+    common/djangoapps/track/modules
+    common/djangoapps/util/modules
+    common/djangoapps/xblock_django/modules

docs/references/docstrings/common_index.rst

@@ -0,0 +1,13 @@
+common
+******
+
+The ``common`` directory in edx-platform is home to an assortment of packages
+used by the LMS and Studio.  This is a legacy code organization decision, and
+it is currently intended that most of the code here will eventually either be
+moved into the ``openedx`` package or broken out into a separately installed
+package.
+
+.. toctree::
+    :maxdepth: 2
+
+    common/common

docs/references/docstrings/index.rst

@@ -0,0 +1,11 @@
+Python Docstrings
+*****************
+
+.. toctree::
+    :maxdepth: 2
+
+    cms_index
+    common_index
+    lms_index
+    openedx/modules
+    xmodule/modules

docs/references/docstrings/lms_index.rst

@@ -0,0 +1,22 @@
+lms
+***
+
+The ``lms`` directory in edx-platform is home to the code needed for the LMS
+(Learning Management System) which is not also needed for the Course Authoring
+Studio.
+
+.. toctree::
+    :maxdepth: 2
+
+    lms/modules
+    lms/djangoapps/badges/modules
+    lms/djangoapps/branding/modules
+    lms/djangoapps/bulk_email/modules
+    lms/djangoapps/courseware/modules
+    lms/djangoapps/coursewarehistoryextended/modules
+    lms/djangoapps/experiments/modules
+    lms/djangoapps/lti_provider/modules
+    lms/djangoapps/mobile_api/modules
+    lms/djangoapps/notes/modules
+    lms/djangoapps/rss_proxy/modules
+    lms/djangoapps/survey/modules