Thank you for giving it a try :)

Yeah, I guess I should describe the proposed workflow in more details and make it as simple as possible :). I will do that in the coming days.

Yes to contribute back you would need to fork the repository on github, clone the fork, make an export of your updated deck on top of it, and then commit, push changes to your fork of the repository on github and create a pull request from your fork.

Initial import can be either from that repository or from Github directly whatever is more convenient for you :).