docs: add some post install steps

docs/how-to-guides/updating-documentation.md

@@ -14,7 +14,7 @@ There are 4 main parts:
 
 To edit and view locally, run:
 
-```
+```sh
 make docs
 ```
 

docs/installation/post-installation.md

@@ -23,3 +23,23 @@ Save the following files to a safe location like a password manager (if you're u
 - Gitea:
     - Username: `gitea_admin`
     - Password: get from Vault
+
+## Run the full test suit
+
+After the homelab has been stabilized, you can run the full test suite to ensure that everything is working properly:
+
+```sh
+make test
+```
+
+!!! info
+
+    The "full" test suit is still in its early stages, so any contribution is greatly appreciated.
+
+## Clean up
+
+Turn off the ephemeral containers:
+
+```sh
+make clean
+```