[DEV,DOC,TST,MNT] Dev docs, testing infrastructure

[minrk]

• add release steps to contributing docs
• develop entrypoint for manual testing (serve file and build:watch)
• add karma scaffolding for tests and github action
• publish npm package from github action (can't test without making a release)

towards #233

[choldgraf]

amazing, thanks! (note it's still in draft, even though the boxes are checked, so I'm not sure if you're done or not...)

[minrk]

Still draft since I didn't know if the actions worked yet. I'll try to add a few 'real' tests. What I have so far is basically "Can I even build a test????"

[choldgraf]

:-) well FWIW I am a big fan of "something is better than nothing"! Also, the more time that passes the higher likelihood I will fall into baby-land and not be able to press the green button, so FWIW you should go for it whenever you think it's ready! I think this is an important step to growing the dev community around this! e.g. I think @phaustin and some folks at UBC are interested in helping out :-)

[phaustin]

For sure, no idea what karma scaffolding is, but I'm confident we can find someone who is pure of heart

[minrk]

Going to land this one as a good starting point, at least