Parameterise the Web vs. Gemini option

Make sure we can never run Halp with a relative Web path

Remove printf debugging

Don't concatenate Web path since we don't support relative paths

Continue fixing weird relative vs. absolute paths

The right thing here would be to have AtomFeed barf if passed a
relative path, at all.

Fix web path handling in Atom generation

Remove full pathname change

Fix Atom feed generation

I'm not expecting these tests to pass in CI first cut, because
it'll *probably* use UTC timestamps.

Start writing some unit tests for the AtomFeed module

Use the correct Web path for Atom feed generation

Adding some Atom feed fixture files for future tests

Use consistent Atom terminology for feeds

Extract MIME types into a separate module

... just because it was making me sad that every time I opened
WebServer.pm I saw a list of (not Web specific!) MIME types.

Extract Atom handling into separate module

Note that this has handily exposed another seam - file handling
utilities that should ultimately prove common to both Web and Gemini
servers.

We don't need to mkdir halp any more

Modify install script to symlink from Git clone

Fix halp rc.d script

+ Ensure the cwd is set correctly.
+ Log output using daemon.

Fix typo

Fix some relative paths in the install script

Fix copypasta addition of certbot call