Restore docs and codecov badges to README.rst

Keep existing ReadTheDocs documentation and codecov badges while
preserving the new quality/maintenance badges added in this PR.

Complete badge list now includes:
- docs (ReadTheDocs)
- build (CI status)
- codecov (code coverage)
- pypi (package version)
- pyversion (Python versions)
- license (MIT)
- ruff (code quality)
- maintained (active development)

Author: jontsai

README.rst

@@ -4,10 +4,18 @@ Overview
 
 .. start-badges
 
+.. |docs| image:: https://readthedocs.org/projects/datapilot/badge/?style=flat
+    :target: https://datapilot.readthedocs.io/
+    :alt: Documentation Status
+
 .. |build| image:: https://github.com/AltimateAI/datapilot-cli/workflows/build/badge.svg
     :target: https://github.com/AltimateAI/datapilot-cli/actions
     :alt: Build Status
 
+.. |codecov| image:: https://codecov.io/gh/anandgupta42/datapilot/branch/main/graphs/badge.svg?branch=main
+    :alt: Coverage Status
+    :target: https://app.codecov.io/github/anandgupta42/datapilot
+
 .. |pypi| image:: https://badge.fury.io/py/altimate-datapilot-cli.svg
     :target: https://pypi.org/project/altimate-datapilot-cli/
     :alt: PyPI Package
@@ -28,7 +36,7 @@ Overview
     :target: https://github.com/AltimateAI/datapilot-cli/graphs/commit-activity
     :alt: Maintained
 
-|build| |pypi| |pyversion| |license| |ruff| |maintained|
+|docs| |build| |codecov| |pypi| |pyversion| |license| |ruff| |maintained|
 
 .. end-badges