Add basic ansible stuff for management

acme-dns is fully handled by ansible already. All services should be
created by ansible in the end.

_ansible/templates/caddy_site.conf.j2

@@ -0,0 +1,4 @@
+{{ service.domain }} {
+	import default
+	reverse_proxy {{ service.name }}:{{ service.port }}
+}

_ansible/templates/docker-compose.yml.j2

@@ -0,0 +1 @@
+{{ compose_default_file | combine(compose_file, recursive=True) | to_nice_yaml }}