Remove jQuery

[Leland]

There's now a path to remove jQuery from the frontend, which will substantially decrease dependencies, page weight, and internal code size.

• Upgrade Bootstrap from v3.x to v5.x
• Replace https://github.com/carhartl/jquery-cookie with vanilla cookies
• Replace https://github.com/evanplaice/jquery-csv with https://github.com/vanillaes/csv
  • Alternatively, change zone_csv_to_md.py to instead output JSON, and interact with it directly in JS.
    This also gives the benefit of allowing Liquid syntax to interact with the data directly, allowing zones/index.html to be tremendously simplified, and allowing the individual zone/ Markdown files to be generated on the fly.
• Replace https://github.com/asual/jquery-address/ with the vanilla URLSearchParams
• Replace jPlayer with the vanilla HTMLAudioElement
• Remove jQuery UI, which looks unused (404ing it during load causes no issues)
• Finally, remove jQuery 🤓