Move docs to cli repo

docs/src/cmd/clean.md

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+# Clean
+
+`dioxus clean` will call `target clean` and remove `out_dir` directory.
+
+```
+dioxus-clean 
+Clean output artifacts
+
+USAGE:
+    dioxus clean
+```
+
+you can use this command to clean all build cache and the `out_dir` content.
+
+```
+dioxus clean
+```
+