Add "Accessing route data" section in getStaticPaths with routePattern

[openscript]

Add section on accessing route data and example code for getStaticPaths.

Description (required)

This documents the proposal to make routePattern available in getStaticPaths. With routePattern it's possible to dynamically calculate the params that getStaticPaths returns. Before it was not possible to access the routePattern because getStaticPaths is executed at a time when Astro.routePattern is not available.

Related issues & labels (optional)

For Astro version: 5.14. See astro PR #13520.

Known as openscript in Discord.

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[sarah11918]

This looks great @openscript ! Thank you for providing such a clear starting point for these docs! 💪

I had some thoughts below for your consideration, and some questions. You are the subject matter expert here, and I'm just suggesting some words that would make this "sound like" Astro Docs, but I'll need to rely on you to confirm some things and make this accurate! 🙌

Then, when we're happy here, we'll tackle the changeset in the Astro PR where we really get to hype how cool this is, introduce it to the world, and encourage people to use it! 🚀

[ArmandPhilippot]

As Sarah said, this looks great. I mostly answered Sarah's suggestion and also give some ideas to improve the code snippet used as example.

[sarah11918]

Approving for 5.14! 🎉

[yanthomasdev]

LGTM! Good job 🙌