todo

prefers-color-scheme
robots.txt, sitemap.xml
error pages: 404, 500, etc
firefox alternative stylesheets too maybe (send more js for chrome to do the thing too)
explicitly block brave (also needs js)
rss/atom
indieweb: microformats2, webmentions, websub, rel=me
reject brave (lol)
support tor and opennic
activitypub
gopher and gemini variants
support for lynx (basic html) and raw curl (ansi codes)
meta generator
meta theme-color, manifest, etc. weird mobile stuff
stylesheet integrity attribute
rel noopener noreferrer
license and rel=license
more semantic rel: rel=icon, rel=home, rel=prev/next, rel=author, rel=canonical etc
pronouns? make up a rel=pronouns or something because uwu
nginx caching headers