[FEAT] - Clickable TOC for blog posts

[bskinn]

What site is this for?

Quansight Consulting, Quansight Labs

Expected behavior

From @lezcano: "I think it could potentially do with a clickable summary of sections and subsections on the side of the post. At the moment three is too much unused space there in a 16x9 screen."

If of interest, this could be implemented for both Labs and Consulting blogs. If we move forward, it will make the most sense to wait until #577 is merged.

Considerations:

• A left-floating TOC probably only makes sense for desktop screen size
  • It might only make sense for wide or high-resolution displays?
• Should we also implement some other kind of clickable TOC for tablet/mobile?
• Should we add a toggle for whether or not to display the TOC?
  • For shorter posts or posts with minimal heading structure, we might want to suppress the TOC

Actual behavior

No floating TOC implemented.

How to Reproduce the problem?

No response

Anything else?

No response