RTD theme fix (#1122)

* pip sphinx-rtd-theme

* Bump sphinx

* Add extension

* Add docs/requirements.txt

* CL

CHANGELOG.md

@@ -16,7 +16,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Added extra installation step to TUTORIAL.md for required installation packages.
 - Added Troubleshooting Tips section to TUTORIAL.md to address common installation issues.
 - Added link to Spotipy Tutorial for Beginners under Getting Started.
-- Readthedocs config
 
 ### Changed
 - Changes the YouTube video link for authentication tutorial (the old video was in low definition, the new one is in high definition)
@@ -31,6 +30,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed
 - Fixed unused description parameter in playlist creation example
+- Readthedocs
 
 ### Changed
 - Drop support for EOL Python 3.7.