Support abbr, del, pre, blockquote, code, strong, b, em, i, and h1…h5
HTML elements in remote statuses, add corresponding CSS.

Port d763d39d26 to glitch-soc

Regression: only one warning at a time

Port ad510db3a1 to glitch-soc

Port 7f75792bf3 to glitch-soc

Port 56f29c38b6 to glitch-soc

Port SCSS changes from 8b69a66380 to glitch-soc

Port bd365cc38b to glitch-soc

Port public pages SCSS changes from 67b3b62b98

Port daab45d4ae to glitch-soc

Port 79227d153b to glitch-soc

Port 379c3e237f to glitch-soc, but changing
the 5 limit to 10, since that's what we had previously

Port JS from 69141dca26 to glitch-soc

Port 58667072d9 to glitch-soc

Port 73f5711fb8 to glitch-soc

Port a91acf79b5 to glitch-soc

Port 6f6abc369f to glitch-soc

Port 186f7bcbb6 to glitch-soc