Compress with brotli ahead of time in CI, just like we do with zopfli
for gzip_static
Update hintrc to check for brotli compression.
Update lighthouse config to throttle CPU some more since brotli
decompression can be heavier.
Inspired by the h-entry implementation on Charlie Owen's personal
website: https://whalecoiner.com
The u-photo re-uses the 32px favicon that the browser has already
cached, so it shouldn't bloat up the page anymore.
These changes required a bit of additional CSS. I snuck in come color
changes too.
