feat(cli): add docgen cmd for mkdocs pages

docs/cli/monitor-work-area-offset.md

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+# monitor-work-area-offset
+
+```
+Set offsets for a monitor to exclude parts of the work area from tiling
+
+Usage: monitor-work-area-offset <MONITOR> <LEFT> <TOP> <RIGHT> <BOTTOM>
+
+Arguments:
+  <MONITOR>
+          Monitor index (zero-indexed)
+
+  <LEFT>
+          Size of the left work area offset (set right to left * 2 to maintain right padding)
+
+  <TOP>
+          Size of the top work area offset (set bottom to the same value to maintain bottom padding)
+
+  <RIGHT>
+          Size of the right work area offset
+
+  <BOTTOM>
+          Size of the bottom work area offset
+
+Options:
+  -h, --help
+          Print help
+
+```