use init.js by default

[sertonix]

This replaces the default init.coffee with an init.js. Both are still handled just the default is moved to match the new direction of pulsar.

[confused-Techie]

This change looks good to me. The only thing I might recommend is making the same PR changes on CONTRIBUTING.md to .github/CONTRIBUTING.md since that is the version we will likely keep in the long run.

Otherwise looks great, and I appreciate you keeping the docs up to date during your PR's as well.

[mauricioszabo]

This is actually pretty good, I've been using the init.js for a while, never saw that Atom didn't change the default init script from Coffee. Merging it now :)

[Daeraxa]

We will also need to update the docs (once the CH2 PR is merged) to reflect this because it currently references the init.coffee in a bunch of places along with code examples.

CH3 is yet to be added (hacking-pulsar) as this has a more in-depth section on it: see the archived version here - https://pulsar-edit.dev/docs/atom-archive/hacking-atom/#the-init-file

Also if the plan is eventually to have an "atom->pulsar" automatic onboarding, a feature to automatically migrate from the .coffee file to the .js one would be rather handy.

[mauricioszabo]

@Daeraxa can we document somewhere, maybe on some discussion, the steps we feel are needed for this atom->pulsar automatic onboarding to work?

[Daeraxa]

Sure, I'll make GH thread for it so we can keep track of it then maybe convert it to a project once we have an idea.
Edit - https://github.com/orgs/pulsar-edit/discussions/63