Migrate docs to svelte4 (#3581)

* Adapt pre-build script to support Windows

* Clean up unused SvelteKit adapters

* Upgrade Svelte to v4

* Bulk-bump deps related to Svelte(Kit)

* Fix SvelteKit version

* Upgrade TS to 5.x

* Fix messages in tsconfig

* Reset some tsconfig settings to SvelteKit default

* Uninstall separate vite-plugin-svelte

It is already included in SvelteKit

* Remove Prettier

* Reorder package.json props

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Co-authored-by: Ndricim Rrapi <[email protected]>