feat(cli): add docgen cmd for mkdocs pages

docs/cli/workspace-padding.md

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+# workspace-padding
+
+```
+Set the workspace padding for the specified workspace
+
+Usage: workspace-padding <MONITOR> <WORKSPACE> <SIZE>
+
+Arguments:
+  <MONITOR>
+          Monitor index (zero-indexed)
+
+  <WORKSPACE>
+          Workspace index on the specified monitor (zero-indexed)
+
+  <SIZE>
+          Pixels to pad with as an integer
+
+Options:
+  -h, --help
+          Print help
+
+```