Experimental autocompletion setup scripts (#378)

* Working completion scripts

* generate.py => install.py

* Uninstall for completions, docs/README updates

* Tune emojis, improve concurrency for completion install

* wip

* Cleanup

* Permissions, shebang checks

scripts/debugging/run_actions.py

@@ -1,3 +1,4 @@
+#!/usr/bin/env python
 """Simple yaml debugger"""
 import subprocess
 import sys