the backend code has been added back in, and the build process has been
modified so that no output files are left outside of build/. Admin page
loads and logs in correctly, nothing else functionality-wise yet.
web UI now uses modules, and relies less on bodge to make things work.
Also fixes an issue where invites where "failed to send to xx" appeared
in invite form.
i wanted to split up the web ui components into multiple files, and
figured it'd be a good chance to try out typescript. run make typescript
to compile everything in ts/ and put it in data/static/.
This is less of a rewrite and more of a refactoring, most of it still
works the same but bits have been cleaned up too.
Remaining javascript found in setup.js and form.html