feat(cli): add docgen cmd for mkdocs pages

docs/cli/resize-axis.md

@@ -0,0 +1,19 @@
+# resize-axis
+
+```
+Resize the focused window or primary column along the specified axis
+
+Usage: resize-axis <AXIS> <SIZING>
+
+Arguments:
+  <AXIS>
+          [possible values: horizontal, vertical, horizontal-and-vertical]
+
+  <SIZING>
+          [possible values: increase, decrease]
+
+Options:
+  -h, --help
+          Print help
+
+```