Progress on podman process

The podman process is now very mature, and some things can actually be
copied over to the original docker process.

Sourcehut now is fully functional, with possibly exception for the mail
service. Needs to be tested. Furthermore, the cron jobs should be
configured to run.

x86/aarch64 simultaneous support is also complete. See the sister repo,
huttese-apk.

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/`.