Release gh action (#1909)

* Gets gh-action ready for marketplace release

* Updates documentation and removes redundant gh-action input argument

* Fixes gh-action bug

This commit fixes a bug which caused not all input arguments were forwarder to the black formatter.

* Update README.md

Co-authored-by: Cooper Lees <me@cooperlees.com>

Co-authored-by: Cooper Lees <me@cooperlees.com>