Remove broken links in editor guide

Author: knolleary

docs/user-guide/editor/index.md

@@ -16,8 +16,8 @@ title: Editor Guide
 
 The editor window consists of four components:
 
- - The header at the top, containing the [deploy button](deploy-button),
-   [user menu](user-menu) and [main menu](main-menu).
+ - The header at the top, containing the deploy button, main menu, and, if user
+   authentication is enabled, the user menu.
  - The [palette](palette) on the left, containing the nodes available to use.
  - The main [workspace](workspace) in the middle, where flows are created.
  - The [sidebar](sidebar) on the right.