chore(docs): remove tabs from appearance settings (#11726)

docs/admin/appearance.md

@@ -56,9 +56,7 @@ and `docs` are available as three special icons.
 
 ### Configuration
 
-<div class="tabs">
-  
-## Kubernetes
+#### Kubernetes
 
 To configure support links in your Coder Kubernetes deployment, update your Helm
 chart values as follows:
@@ -79,7 +77,7 @@ coder:
         "/emojis/1f3e1.png"}]
 ```
 
-## System package
+#### System package
 
 if running as a system service, set an environment variable
 `CODER_SUPPORT_LINKS` in `/etc/coder.d/coder.env` as follows,
@@ -95,8 +93,6 @@ export CODER_SUPPORT_LINKS='[{"name": "Hello GitHub", "target": "https://github.
 coder-server
 ```
 
-</div>
-
 ## Up next
 
 - [Enterprise](../enterprise.md)