docs(refactor): Restructure document hierarchy

Additionally rename `installation-examples.md` and split

docs/content/config/advanced/maintenance/update-and-cleanup.md

@@ -0,0 +1,41 @@
+---
+title: 'Maintenance | Update and Cleanup'
+---
+
+## Automatic Update
+
+Docker images are handy but it can get a a hassle to keep them updated. Also when a repository is automated you want to get these images when they get out.
+
+One could setup a complex action/hook-based workflow using probes, but there is a nice, easy to use docker image that solves this issue and could prove useful: [`watchtower`](https://hub.docker.com/r/containrrr/watchtower).
+
+A docker-compose example:
+
+```yaml
+services:
+  watchtower:
+    restart: always
+    image: containrrr/watchtower:latest
+    volumes:
+      - /var/run/docker.sock:/var/run/docker.sock
+```
+
+For more details, see the [manual](https://containrrr.github.io/watchtower/)
+
+## Automatic Cleanup
+
+When you are pulling new images in automatically, it would be nice to have them cleaned up as well. There is also a docker image for this: [`spotify/docker-gc`](https://hub.docker.com/r/spotify/docker-gc/).
+
+A docker-compose example:
+
+```yaml
+services:
+  docker-gc:
+    restart: always
+    image: spotify/docker-gc:latest
+    volumes:
+      - /var/run/docker.sock:/var/run/docker.sock
+```
+
+For more details, see the [manual](https://github.com/spotify/docker-gc/blob/master/README.md)
+
+Or you can just use the [`--cleanup`](https://containrrr.github.io/watchtower/arguments/#cleanup) option provided by `containrrr/watchtower`.