Add mediaserver, rm .gitignore, FQCN, Jellyfin

- Added development "mediaserver" playbook for testing
- rm .gitignore in roles dir since no external ansible roles are used
- Update a part of the base role to use FQCN for linting
- Added "jellyfin" role to install Jellyfin with docker-compose
- Updated Traefik to use the loopback for default web entry points
- Simplified Traefik docker-compose vars, Ansible sets defaults

roles/jellyfin/handlers/main.yml

@@ -0,0 +1,5 @@
+- name: Restart Jellyfin
+  service:
+    name: "{{ docker_compose_service }}@{{ jellyfin_name }}"
+    state: restarted
+  listen: restart_jellyfin