Switch from make to js tasks

[titaniumbones]

It would probably be easier to attract contributors if the devleopment process took place entirely using js/node-based tools. So, ideally we would:

• build
• lint
• test

using js-native tools, as most other JavaScript projects now do.

This would e.g. solve #82, and would make it much easier to solve #58 for users. Automatic releases via Github Actions (cf. https://github.com/actions/create-release) and CI-based testing would be a next step (once we solve #65).