chore: migrate to Vite

[GVodyanov]

Big thanks to @susnux for helping out

	Webpack	✨Vite✨
Dev build	45M	7.7M
Production build	19M	3.7M

This is with map files removed

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 59.48%. Comparing base (8f52c6b) to head (97b4954). Report is 31 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #6357 +/- ## ============================================= + Coverage 23.54% 59.48% +35.93% Complexity 454 454 ============================================= Files 247 41 -206 Lines 11700 2231 -9469 Branches 2213 0 -2213 ============================================= - Hits 2755 1327 -1428 + Misses 8624 904 -7720 + Partials 321 0 -321 ``` | [Flag](https://app.codecov.io/gh/nextcloud/calendar/pull/6357/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nextcloud) | Coverage Δ | | |---|---|---| | [javascript](https://app.codecov.io/gh/nextcloud/calendar/pull/6357/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nextcloud) | `?` | | | [php](https://app.codecov.io/gh/nextcloud/calendar/pull/6357/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nextcloud) | `59.48% <ø> (-0.06%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nextcloud#carryforward-flags-in-the-pull-request-comment) to find out more.

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[GVodyanov]

First issue: previewing appointments doesn't have styling

[st3iny]

See also #6068. I don't remember exactly but I fixed some regressions there. You could have a look at the differences.

[GVodyanov]

See also #6068. I don't remember exactly but I fixed some regressions there. You could have a look at the differences.

Yeah... We did this during Ferdinand's workshop and didn't know that you had already done it 😅

[GVodyanov]

Fixed by #6068