fix(docs): installation instruction for plain svelte vite

[doaortu]

Why?

The installation instruction for plain svelte + vite (i.e. not sveltekit) is missing step to also edit the resolve config in vite.config.js, so that vite can understand the $lib alias.

Note:

I've read the contributing guide, and I think I don't need to open an issue because this PR is trivial enough.

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Name	Status	Preview	Comments	Updated (UTC)
shadcn-svelte	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jan 10, 2024 6:39pm

[huntabyte]

Thank you!

[AdrianGonz97]

thank you!