feat(cli): add docgen cmd for mkdocs pages

docs/cli/focus-follows-mouse.md

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+# focus-follows-mouse
+
+```
+Enable or disable focus follows mouse for the operating system
+
+Usage: focus-follows-mouse [OPTIONS] <BOOLEAN_STATE>
+
+Arguments:
+  <BOOLEAN_STATE>
+          [possible values: enable, disable]
+
+Options:
+  -i, --implementation <IMPLEMENTATION>
+          [default: windows]
+
+          Possible values:
+          - komorebi: A custom FFM implementation (slightly more CPU-intensive)
+          - windows:  The native (legacy) Windows FFM implementation
+
+  -h, --help
+          Print help (see a summary with '-h')
+
+```