docs: mention that you can use Vite plugins

[benmccann]

I was surprised this wasn't already on the integrations page

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[ghostdevv]

Is there a case where people haven't realised this? Since we changed sveltekit to being a vite plugin pre1.0 I thought it was quite obvious?

[benmccann]

It might be obvious you can use Vite plugins, but it's still helpful to provide a link to the list of Vite plugins that are available and good marketing to mention it alongside the other integrations we offer