* docs: unify nginx explainers and add apache httpd
there are two places where nginx + certbot is explained, unify that into
one place.
Add apache httpd, following the same steps, but using mod_md for
LetsEncrypt
add a note about #453 in both guides.
Link to both, and call the section reverse proxy, instead of NGINX
* restore full nginx.conf from docker.md
* add installation_guide/apache-httpd.md to mkdocs
* exludes docker-volume from exemple/docker-compose
* Adds an docker-compose.yaml example and adds some readme to the
docker.md
* Changes Docker-Compose Example
* Configures docker-compose.yaml and docker.md
* Adds some cosmetics to the Documentation
* Adds UserID:GroupID
* Describes how to create a new user
tobi