feat(templates/cloudflare-pages): add _routes.json

[jrf0110]

👋

John here from the Cloudflare Pages team.

_routes.json is a new optional file from Cloudflare Pages. It describes how Pages Functions are routed through the Cloudflare Workers runtime. Via inclusion and exclusion rules, we route traffic to your Pages Functions or to static assets.

As noted in the contributing doc, I've branched off of main instead of dev since this only changes a template.

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