feat(cli): add docgen cmd for mkdocs pages

docs/cli/window-hiding-behaviour.md

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+# window-hiding-behaviour
+
+```
+Set the window behaviour when switching workspaces / cycling stacks
+
+Usage: window-hiding-behaviour <HIDING_BEHAVIOUR>
+
+Arguments:
+  <HIDING_BEHAVIOUR>
+          Possible values:
+          - hide:     Use the SW_HIDE flag to hide windows when switching workspaces (has issues with Electron apps)
+          - minimize: Use the SW_MINIMIZE flag to hide windows when switching workspaces (has issues with frequent workspace switching)
+          - cloak:    Use the undocumented SetCloak Win32 function to hide windows when switching workspaces (has foregrounding issues)
+
+Options:
+  -h, --help
+          Print help (see a summary with '-h')
+
+```