Initialise repository structure and placeholder files. Generic functionality works i guess, need to come up with a better solution for compose templates

docs/service-catalog.md

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+# Service Catalog
+
+These Docker service roles are available through `nbops_roles`.
+
+Media and downloads:
+
+- `jellyfin`
+- `jellyseerr`
+- `qbittorrent`
+- `transmission`
+- `wizarr`
+- `flaresolverr`
+- `cleanuparr`
+- `pinchflat`
+- `kavita`
+
+Identity and access:
+
+- `authentik`
+- `authentik_ldap`
+- `authentik_proxy`
+- `authentik_rac`
+- `vaultwarden`
+
+Dashboards and file tools:
+
+- `homarr`
+- `nginx_content`
+- `code_server`
+- `filebrowser_quantum`
+- `kiwix_serve`
+- `requarks`
+- `fiveetools`
+- `ntfy`
+
+Infrastructure:
+
+- `pelican_panel`
+- `pelican_server`
+- `gitea`
+- `gitea_act_runner`
+- `postgres`
+- `php_fpm`
+- `valkey`
+- `syncthing`
+- `ipv6nat`
+
+Monitoring:
+
+- `grafana`
+- `loki`
+- `alloy`
+- `grafana_renderer`
+- `prometheus`
+- `uptime_kuma`
+
+Most roles use the shared `docker_app` implementation and support:
+
+- `host` routing mode: publish ports directly and open UFW rules.
+- `traefik` routing mode: attach to the proxy network and render Traefik labels.
+
+Override role defaults in `host_vars` or `group_vars`; do not edit generated
+Compose files on the VM.