Document new astro:route:setup hook

[bluwy]

Description (required)

Adds documentation for the new astro:route:setup hook based on the core PR below.

The main use of this new hook is to configure route options dynamically (in this case, only the prerender option for now). See the core PR for more info!

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For Astro version: 4.14. See astro PR withastro/astro#11657

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[sarah11918]

Thank you for making this so easy for me, @bluwy 💪

I left a couple of quick suggestions for how I could envsion making this a bit more future-proof. See what you think, and whether this makes any sense!

[bluwy]

I've added and updated the route.prerender section