feat(cli): add docgen cmd for mkdocs pages

docs/cli/cross-monitor-move-behaviour.md

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+# cross-monitor-move-behaviour
+
+```
+Set the behaviour when moving windows across monitor boundaries
+
+Usage: cross-monitor-move-behaviour <MOVE_BEHAVIOUR>
+
+Arguments:
+  <MOVE_BEHAVIOUR>
+          Possible values:
+          - swap:   Swap the window container with the window container at the edge of the adjacent monitor
+          - insert: Insert the window container into the focused workspace on the adjacent monitor
+
+Options:
+  -h, --help
+          Print help (see a summary with '-h')
+
+```