JavaScript library updates

[ddabble]

Proposed changes

Improvements

• Updated all of the self-hosted JavaScript libraries the website uses
  • Updated Fomantic-UI to 2.9.2 (fbedf940a68fdf7eb387084774ccf3925a231769)
  • Updated jQuery to 3.6.3 (cbdedccaf6e1342c1fc16c19ac15247db4426ad9)
  • Updated jquery.dirty to 0.8.4 (5272325ad02278e0548ea4416ec9641399e1bd56)
  • Updated Parallax.js to 1.5.0 (6eb749d5a709dd92c1c3339ddae99da13b26bc49)

Fixes

• Made CSS selectors for Fomantic-UI more specific (d89dcfd36732ffc31d7be05007e78a7cc3ce556e)
• Fixed unresponsive FAQ list accordion titles and improved their design (d2bf20605452b6765203395036f1e03b839f32c8)

Other changes

• Added files for building and updating Fomantic-UI (1cc6c25b4cb011ed6995f1c5827ec83843dcd65b)
  • A guide on how to actually build and update Fomantic-UI has been (indirectly) linked to in README.md, and can be found here: wiki/Updating-Fomantic-UI

Areas to review closely

Checklist

(If any of the points are not relevant, mark them as checked)

• [ ] Created tests that fail without the changes, if relevant/possible
• [x] Made sure that your code conforms to the code style guides and that any common code smells have been addressed
  • (It's not intended that you read through this whole document, but that you get yourself an overview over its contents, and that you keep it in mind while taking a second look at your code before opening a pull request)
• [x] Added sufficient documentation - e.g. as docstrings or in the README, if suitable
• [x] Added your changes to the "Unreleased" section of the changelog - mainly the changes that are of particular interest to users and/or developers, if any
• [x] Added a "Deployment notes" section above, if anything out of the ordinary should be done when deploying these changes to the server

[ddabble]

Merging without explicit approval from another member, as the Dev committee agreed to merge these changes and assume they're relatively bug-free, simply to get things done quicker.