use env.BASE_URL instead of env.SERVER_BASE_URL

[Brendonovich]

SERVER_BASE_URL was used with Vinxi, now we just rely on Vite's base config which is accessible via env.BASE_URL.

This only makes Start work properly, extra work is currently needed by the end user to make Router work:

<Router base={import.meta.env.BASE_URL} actionBase={`${import.meta.env.BASE_URL}/_server`}>

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