index.md - Add "🤗 Hugging Face Hub - Table of Contents" above un-labeled colored boxes.

[gamepad-coder]

=== What ===

• Add ## 🤗 Hugging Face Hub - Table of Contents
  below the intro paragraph
  but above the colorful boxes for the table of contents in the middle of the page.

=== Motivation ===

• It's not obvious to a first time visitor that the flex grid in the middle is the same set of information in the sidebar.

• By telling the user these colored boxes are the table of contents (and not micellaneous out-links -- which I initially thought), it becomes clearer, more orienting, and less overwhelming.

=== Mockup ===

• Before PR
  • 

• After PR
  • 

[gamepad-coder]

Note the mockup above was done by hand in the browser.

=== Additional Wiring Needed? ===

• I'm unsure if the build tool will automatically add the H2 link in the righthand sidebar, or if additional steps are needed?
• I'm unsure if the href hash anchors are automatically generated for all H2 tags or not
  • i.e. #hugging-face-hub-table-of-contents for in-page navigation links like
  • index.html#hugging-face-hub-table-of-contents.