Document lua, fix small theme bugs

whitelist -> allowlist

Add custom font support.

Remove redundant HTML escaping helpers.

Add GPL notice to README

Add GPL notice to README

Update README to reflect new site.

Fix README typos

Create plain theme, do some escaping, fix some busted envvars, document themes.

reorganize readme

Fix bullet points

lots of stuff. theming basically done, added some logging, frontend basically done.

fix highlighting

ugh

config done