Add admonitions marking community-provided docs

docs/running-headscale-container.md

@@ -1,7 +1,11 @@
 # Running headscale in a container
 
-**Note:** the container documentation is maintained by the _community_ and there is no guarentee
-it is up to date, or working.
+!!! warning "Community documentation"
+
+    This page is not actively maintained by the headscale authors and is
+    written by community members. It is _not_ verified by `headscale` developers.
+
+    **It might be outdated and it might miss necessary steps**.
 
 ## Goal