These are mostly grammar fixes. Furthermore:
* docs(docker,delegation): Use `important` admonitions in some places
* docs(maintenance): Elaborate on `immutable` directive in media header
* Use 2-spaces indentation instead of 4
* Use `proxy` as network name instead of `caddy` to be consistent
* Mount Caddyfile for delegated example as well
The `configs.content` approach only works for Docker, so doing this
would be more inclusive for Podman users
Also removed Nexy's forge as it is currently limited access