feat(cli): add docgen cmd for mkdocs pages

docs/cli/workspace-layout.md

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+# workspace-layout
+
+```
+Set the layout for the specified workspace
+
+Usage: workspace-layout <MONITOR> <WORKSPACE> <VALUE>
+
+Arguments:
+  <MONITOR>
+          Monitor index (zero-indexed)
+
+  <WORKSPACE>
+          Workspace index on the specified monitor (zero-indexed)
+
+  <VALUE>
+          [possible values: bsp, columns, rows, vertical-stack, horizontal-stack, ultrawide-vertical-stack]
+
+Options:
+  -h, --help
+          Print help
+
+```