add an endpoint for removing users

Fixed some bugs:

Two edgecases in datetime handling:
  - rfc3339 + nano
  - rfc3339, but omits seconds

Makefile now non-destructively installs over previous versions.

better datestamp parsing. moved 'registry' library

into this repo. updated references regarding the move
to sourcehut.

serving arbitrary static assets under /static/

using this to serve a local copy of water.css rather
than the remote copy.

Another source of duplicated statuses fixed

eliminated panic when serving reqs from empty registry,

removed experimental TLS and hostmatching support,
updated dependencies.

updated dep getwtxt/registry to fix duplicated statuses

Minor release:

Tests now use a constructed file rather than my live twtxt.txt file

Added a few comments above functions that weren't commented previously

Makefile now only removes the binary, logs, and config file on
uninstall, where previously it removed the whole /usr/local/getwtxt
directory. This is to leave the database intact.

cleanup and some bugfixes

config change, minor