[Github Action] Integrate JSON version of .conf file as per YNAP project

[nocalla]

Other feature request

Is your feature request related to a problem? Please describe.
As per #270, the concept of a drag n' drop conversion website has been taken up by @leolabs' https://github.com/leolabs/you-need-a-parser project, meaning our #266 website idea is slightly redundant. However, we could at least integrate the efforts of the two projects by providing an up-to-date config file that YNAP can use.

Describe the solution you'd like
#270 (comment)

Thanks! I've extracted my script to generate the JSON config into a separate NPM package called ynap-bank2ynab-converter (source code). It fetches the current bank2ynab config from a given branch of your repo (default: master) and generates the JSON config. You can easily run it like this, given that you have node, npm, and npx installed:

$ npx ynap-bank2ynab-converter
If you want to use the tool pre-commit, I can include an option to provide a local config file instead of the GitHub branch. Maybe you can also use GitHub Actions, GitLab CI or Travis CI to automatically commit the generated JSON file to your repo.

We could use the idea of a Github Action workflow to use @leolabs automatic conversion and provide a one-stop shop for conversion formats. This reduces the effort fragmentation without adding to anyone's workload.