- Update to Traefik v3 syntax

This reverts commit 892780d1.
$PWD does not work when deploying as a Swarm stack.

- Remove `version`
- `version` is obsolete

- https://docs.gitlab.com/omnibus/settings/nginx.html#setting-the-nginx-listen-address-or-addresses
- Update README
- Update references

- Remove fosspay

- Update references to current state

- Add donation buttons

- Update .gitignore