refactor: upgrade from CRA to Vite

[Mohammer5]

I've added our dhis2 linter & prettier configs (by just copying them over). I haven't applied them so I can rebase / merge any changes in master while this PR is still in review.

If you want to check out the amount of changes, just run yarn eslint (for eslint) or yarn prettier (for prettier; running yarn lint will fail (due to eslint issues), so it won't display the prettier issues).

Known issues

• Jest tests of .tsx files doesn't work right now.
  There aren't any component tests yet, so it's something we can address after merging this PR. But we should address is!
• This repo now uses prettier and eslint directly, which means we can't have the convenience of d2-style anymore.
  But this is in line with what we want to move towards anyway, see this slack message.
• We can't use "type": "module" in the package.json (see here)

[HendrikThePendric]

Left a few comments, but only minor points, so LGTM 🚀

[Chisomchima]

lgtm