feat(cli): add docgen cmd for mkdocs pages

docs/cli/resize-edge.md

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+# resize-edge
+
+```
+Resize the focused window in the specified direction
+
+Usage: resize-edge <EDGE> <SIZING>
+
+Arguments:
+  <EDGE>
+          [possible values: left, right, up, down]
+
+  <SIZING>
+          [possible values: increase, decrease]
+
+Options:
+  -h, --help
+          Print help
+
+```