File-Based Routing in Astro

src/pages/
├── index.astro          → /
├── about.astro          → /about
├── blog/
│   ├── index.astro      → /blog
│   ├── post-1.astro     → /blog/post-1
│   └── [slug].astro     → /blog/:slug
├── api/
│   └── posts.json.ts    → /api/posts.json
└── _hidden.astro        → Not routed (underscore)