feat(cli): add docgen cmd for mkdocs pages

docs/cli/display-index-preference.md

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+# display-index-preference
+
+```
+Set the display index preference for a monitor identified using its display name
+
+Usage: display-index-preference <INDEX_PREFERENCE> <DISPLAY>
+
+Arguments:
+  <INDEX_PREFERENCE>
+          Preferred monitor index (zero-indexed)
+
+  <DISPLAY>
+          Display name as identified in komorebic state
+
+Options:
+  -h, --help
+          Print help
+
+```