Migrate pages to use `prose` class in Tailwind typography plugin

[wei2912]

A couple of pages on the website have shifted to use the prose class from https://github.com/tailwindlabs/tailwindcss-typography; however, many of our pages are still styled directly, so the typography is inconsistent from page to page.

Ideally, we would shift all pages to the prose class in order to have consistent styling that can be easily modified by applying additional styles onto prose. However, historically this has caused a couple of conflicts with some pages, e.g. see discussions at #249, #294.

[wei2912]

This issue is pretty open (since I'm not certain if doing this is an advisable move), will leave it to whoever's working on this to research and see if it's a good idea, and what sort of work needs to be done to carry this out.