Add citations/footnotes using remark-gfm

[DylanB5402]

Description

Put together citations/footnote to refer to wpilib or vendordep docs using remark-gfm. Pretty sure this is failing CI right now, wanted to get thoughts on whether we actually like doing citations like this before moving forward with cleaning it up and adding them to the rest of 1b.

See the bottom of this page to see what the footnotes actually look like on a page:

https://pr-171.frcsoftware.pages.dev/learning-course/stage1/stage1b/commands-and-mechanisms/

For #169

[github-actions]

🌐 Preview URL: https://pr-171.frcsoftware.pages.dev

[zachwaffle4]

Starlight natively supports GFM footnotes, the remark plugin is unnecessary.

[Daniel1464]

I dig the idea of having footnotes, although I think that they need to be more visually striking. I also think that the footnote section needs different formatting (currently, it seemingly inserts an invisible header)

[Adrianamm]

I dig the idea of having footnotes, although I think that they need to be more visually striking. I also think that the footnote section needs different formatting (currently, it seemingly inserts an invisible header)

I agree. Maybe we could make a new call out for it? You can make a new one in the aside.astro file

[DylanB5402]

@zachwaffle4 Starlight supports GFM footnotes natively, but our linting pipeline with remark doesn't. Adding GFM to our lint pipeline also throws up a bunch of fun new errors - figure we should align on this before I go down any rabbit hole that involves changing lint rules