Table of contents plugin

[vincerubinetti]

Would be nice to have a table of contents for longer pages of content. This can be done pretty easily with javascript like we did for Manubot, but it'd also be nice to have it statically generated at compile time. Unfortunately github pages doesn't support jekyll-toc, so it'll have to be done with javascript for now.

[vincerubinetti]

Marking this as enhancement because so far people don't really have pages that are too long/tall, and they probably shouldn't if they want to make their websites more friendly. We have it in Manubot because those are manuscripts, which have to be a lot longer. A website generally shouldn't be as long and dense as a manuscript.

Users can always make their own table of contents manually at the top of the page like this:

- [🎓 Education](#education)
- [👷🏾 Experience](#experience)
- [🔨 Skills](#skills)

## Education

text text text text text text text text text text text text text text text text text text text text text text text text text
text text text text text text text text text text text text text text text text text text text text text text text text text
text text text text text text text text text text text text text text text text text text text text text text text text text
text text text text text text text text text text text text text text text text text text text text text text text text text

## Experience

text text text text text text text text text text text text text text text text text text text text text text text text text
text text text text text text text text text text text text text text text text text text text text text text text text text
text text text text text text text text text text text text text text text text text text text text text text text text text
text text text text text text text text text text text text text text text text text text text text text text text text text

## Skills

text text text text text text text text text text text text text text text text text text text text text text text text text
text text text text text text text text text text text text text text text text text text text text text text text text text
text text text text text text text text text text text text text text text text text text text text text text text text text
text text text text text text text text text text text text text text text text text text text text text text text text text

[vincerubinetti]

Also a jump to top button.

[vincerubinetti]

Also a progress bar at top of page like https://alshedivat.github.io/al-folio/cv/.