docs: rework and split up docs on creating a new web service

- Split out the general information on how to set up a new VM on
  Chaosknoten to have it be more generally useful.
- Also split out the section on monitoring to not have it intermingled
  with the other information.
- Rework the guides to include more information and be more streamlined.
  Also remove duplicate information along the way.

docs/guides/monitoring-gatus.md

@@ -0,0 +1,18 @@
+---
+title: "Monitoring: Gatus"
+summary: How to Setup Monitoring Using Gatus
+---
+
+# Monitoring: Gatus
+
+After configuring a new service or website, it should be added to our status and uptime monitoring available at [status.hamburg.ccc.de](https://status.hamburg.ccc.de).
+
+Take a look at the configuration in `resources/external/status/docker_compose/config` and extend it to cover the newly added service or website. The configuration should probably happen in either `services-chaosknoten.yaml` or `websites.yaml`.  
+Taking the existing configuration as a reference should give guidance on how to configure new checks.  
+Additionally, there's the comprehensive [Gatus Documentation](https://github.com/TwiN/gatus?tab=readme-ov-file#table-of-contents).
+
+After you've added some checks, the configuration can be deployed using:
+
+```
+ansible-playbook playbooks/deploy.yaml -i inventories/external -l status -t docker_compose
+```