impr: optimize use of fontawesome (fehmer)

[fehmer]

Reduces the size of fontawesome by approx 90%.

current sizes

file	size
fa.min.css	13.2 kB
fa-solid-900.woff2	79.9 kB
fa-brands-400.woff2	77.2 kB
total	170.3 kB

optimized sizes

fontawesome 6

file	size
fa.min.css	2.6 kb
fa-solid-900.woff2	13.1 kB
fa-brands-400.woff2	1.6 kB
total	17.3 kB

fontawesome 5

file	size
fa.min.css	12.3 kb
fa-solid-900.woff2	11.5 kB
fa-brands-400.woff2	1.4 kB
total	25,2 kB

[github-actions]

This PR is stale. Please trigger a re-run of the PR check action.

[monkeytypegeorge]

Continuous integration check(s) failed. Please review the failing check's logs and make the necessary changes. https://github.com/monkeytypegame/monkeytype/actions/runs/9380179897