chore: add editor autocompletions to site-kit

[trueadm]

Partly addresses #321.

I spent forever trying to unify both editors, but I didn't want to continue to spend eternity on this – the editors are an absolute mess of hardcoded hacks bandaged on to the UI and with a few dozen or so stores. It needs a rewrite from scratch and that will likely take a good week to do right.

Instead, I unified the autocomplete so that we now get the right autocompletes for JavaScript in the tutorial.

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[Rich-Harris]

The autocompletes are broken:

I made some progress on getting it to work properly, but it involves adding a bunch of tutorial-specific code (aka tech debt) and it's still broken — the state doesn't update when a different file is selected. I think this adventure underscores the need to do a proper refactor

[trueadm]

I think this adventure underscores the need to do a proper refactor

100%, I couldn't agree more, but having spent quite a bit of time today with the codebase for both editors – it's non-trivial. It's entirely up to you if you feel it takes precedence, but in the manner of keeping sanity this week, I feel it can likely wait.

I see you fixed the pathing issue – thank you. Instead of hardcoding paths for the tutorial couldn't we sanitise by local files only ./xxx? Maybe you tried that and it didn't work though?

[Rich-Harris]

It should be possible to import from a parent directory, just not hidden files (and app.html is another special case)