feat(site): migrate from Next.js to Astro

Replace Next.js 16 + React 19 with Astro 5. Same visual design,
same deploy pipeline, zero client-side framework.

- All components rewritten as .astro files
- Dark mode via inline scripts (no React context)
- Timeline animation via IntersectionObserver script
- Nav active state computed at build time
- Self-hosted Source Code Pro woff2 fonts
- Drop Font Awesome (icons were never loaded)
- Drop unused headshot PNG (1MB, unreferenced)
- Fix pfSense hardware refs (Netgate 1100, not N100)
- Output: 212KB static HTML vs 2.6MB before
- JS shipped: ~700 bytes inline vs ~130KB React runtime

tsconfig.json

@@ -1,34 +1,9 @@
 {
+  "extends": "astro/tsconfigs/strict",
   "compilerOptions": {
-    "target": "ES2017",
-    "lib": ["dom", "dom.iterable", "esnext"],
-    "allowJs": true,
-    "skipLibCheck": true,
-    "strict": true,
-    "noEmit": true,
-    "esModuleInterop": true,
-    "module": "esnext",
-    "moduleResolution": "bundler",
-    "resolveJsonModule": true,
-    "isolatedModules": true,
-    "jsx": "react-jsx",
-    "incremental": true,
-    "plugins": [
-      {
-        "name": "next"
-      }
-    ],
+    "baseUrl": ".",
     "paths": {
       "@/*": ["./src/*"]
     }
-  },
-  "include": [
-    "next-env.d.ts",
-    "**/*.ts",
-    "**/*.tsx",
-    ".next/types/**/*.ts",
-    ".next/dev/types/**/*.ts",
-    "**/*.mts"
-  ],
-  "exclude": ["node_modules"]
+  }
 }