feat(cli): add docgen cmd for mkdocs pages

docs/cli/resize-delta.md

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+# resize-delta
+
+```
+Set the resize delta (used by resize-edge and resize-axis)
+
+Usage: resize-delta <PIXELS>
+
+Arguments:
+  <PIXELS>
+          The delta of pixels by which to increase or decrease window dimensions when resizing
+
+Options:
+  -h, --help
+          Print help
+
+```