template(spa): Provide example of server that can handle SPA routes

[ngbrown]

Because this also fixes the typo of "yo" -> "to" this pull request supersedes #8639.

Because http-server isn't able to serve the index.html file as a fallback for what would otherwise be 404 routes (see #8624) it is best to suggest a different server to preview or run a built SPA application. This change doesn't change how the start script in package.json uses http-server because that is not specifically addressed in the README.md.

This change includes part of the README.md updates from #8624, but without the changes to packages/remix-dev/vite/plugin.ts needed to support vite preview.

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[brophdawg11]

Thanks!