Should only use `ADD` for URLs (and even then, `curl` or `wget` are preferred, for numerous reasons, even within this repo) and when extracting archive contents as part of the `ADD` operation; otherwise `COPY` is clearer and (slightly) more efficient.
Caddy, NGINX and Apache2 should have the same default application paths. The `public/` path suffix is now added in the dotenv file to be able to use Laradock for non-laravel projects as well. Also, updated the documentation.
