feat(cli): add docgen cmd for mkdocs pages

docs/cli/invisible-borders.md

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+# invisible-borders
+
+```
+Set the invisible border dimensions around each window
+
+Usage: invisible-borders <LEFT> <TOP> <RIGHT> <BOTTOM>
+
+Arguments:
+  <LEFT>
+          Size of the left invisible border
+
+  <TOP>
+          Size of the top invisible border (usually 0)
+
+  <RIGHT>
+          Size of the right invisible border (usually left * 2)
+
+  <BOTTOM>
+          Size of the bottom invisible border (usually the same as left)
+
+Options:
+  -h, --help
+          Print help
+
+```