Describe the issue linked to the documentation

Add these social media links to the scikit-learn home page, in the "Community" section:

• Twitter: https://twitter.com/scikit_learn
  • Update Twitter in Community Section #21241
• LinkedIn: https://www.linkedin.com/company/scikit-learn/
  • Added link to LinkedIn site to readme file #21650
• Twitter (commits): https://twitter.com/sklearn_commits
• YouTube: https://www.youtube.com/channel/UCJosFjYm0ZYVUARxuOZqnnw/playlists
• Facebook: https://www.facebook.com/scikitlearnofficial/
• Instagram: https://www.instagram.com/scikitlearnofficial/

Suggest a potential alternative/fix

These are the files that need to be updated:

1. README.rst https://github.com/scikit-learn/scikit-learn/blob/main/README.rst
2. index.html https://github.com/scikit-learn/scikit-learn/blob/main/doc/templates/index.html

Notes

cc: @laurburke

Note for Beginners

Here are notes on how to get started:

1. Read the documentation: https://scikit-learn.org/stable/developers/contributing.html
2. Read notes on Git: https://www.dataschool.io/how-to-contribute-on-github/
3. Watch videos: https://www.youtube.com/playlist?list=PLBKcU7Ik-ir-b1fwjNabO3b8ebs9ez5ga
4. Go through the code base, explore it and find the file(s) where the edits need to be made.
5. Read Stack Overflow's "How do I ask a good question?"
6. Be inclusive in your communications: inclusive language
   • Do not use salutations such as "Hello Sir", or "Hey guys" (Why: these terms exclude women and non-binary people.)
   • Do not use salutations such as "Hello Sir/Madam" (Why: these terms assume gender is binary, and they exclude non-binary people.)

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