Fix RTD subproject link and clean Sphinx docs warnings

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: vvinit594

docs/source/aboutcode-projects/aboutcode-toolkit-project.rst

@@ -10,5 +10,5 @@ provides a standard ABCD format for yaml files to document software
 provenance and license metadata in a codebase where this is not already
 covered by a package manager.
 
-  - Read more at: https://aboutcode-toolkit.readthedocs.io
+  - Read more at: https://aboutcode.readthedocs.io/projects/aboutcode-toolkit/en/latest/
   - Get the code at: https://github.com/aboutcode-org/aboutcode-toolkit

docs/source/contributing.rst

@@ -34,4 +34,4 @@ Contribution Guidelines:
    contributing/writing_good_commit_messages
    contributing/testing
    contributing/contrib_doc
-    contributing/release_news
+   contributing/release_news

docs/source/index.rst

@@ -1,6 +1,6 @@
-#########
+##########
 AboutCode
-#########
+##########
 
 Welcome to the AboutCode documentation homepage. `AboutCode.org
 <https://www.aboutcode.org/>`_ is a community of open source developers who
@@ -27,9 +27,9 @@ Overview
 
    aboutcode-project-overview
 
-********
+*********
 Standards
-********
+*********
 
 .. toctree::
    :maxdepth: 2

docs/source/news/overview.rst

@@ -1,6 +1,6 @@
-#############################
+######################################
 How release posts are structured
-#############################
+######################################
 
 Release posts are short and consistent so they can be generated automatically.
 Each post includes:

docs/source/standards/index.rst

@@ -1,6 +1,6 @@
-###############################
+################################
 AboutCode proposals (ABC series)
-###############################
+################################
 
 Org-wide standards and policies are captured as AboutCode proposals, numbered
 ``ABC-XXXX``. Each proposal lives in this repository, is reviewed in a Pull