Merging contribution from shpingalet007 to allow arguments

[shanegenschaw]

Merging contributions from @shpingalet007 to allow arguments in PR Khan#34

Changes

1. Added GitHub Actions input - allow_arguments: Boolean. It enables/disables arguments parsing. It is set to false by default.
2. Arguments parsing via double-asterisk marker - script looks for ** in trigger and considers the marked part of the comment as argument. Output to the steps.check.outputs.arguments. It doesn't do anything if allow_arguments: false.
3. Add new example - add job that enables debugging #deploy on ** environment comment.

Other changes

• Replace npm @zeit/ncc to @vercel/ncc as it was deprecated.
• Upload new action NCC build.
• Documented everything in Readme.md.