Configuration updates

The NGINX and Sourcehut configurations now are set for the final domains
(i.e. git.dominic-ricottone.com not git.intra.dominic-ricottone.com).

Paths in Makefiles are now set for deployment.

The Makefile has been split between `docker` and `podman` versions. The
`docker` version is effectively final. I will be working with `podman`
from this point on.

All services are up and running via `supervisord`, with possible exception
for `todosrht-lmtp`. I continue to try small changes to Postfix and/or
`todosrht` configurations.

Refactoring

The site is no more functional now. But the databases are now in
separate containers, and there is a working recipe for managing the
database initialization/migration (via `make dbinit` and `make dbmigrate`).
This should speed up image builds and container starts, and make the
entire development cycle faster.

Sourcehut files have been moved to `sr/`.