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

.gitignore

@@ -1,33 +1,17 @@
 # dependencies
 /node_modules
-/.pnp
-.pnp.js
 
-# next.js
-/.next/
+# astro
 /out/
-
-# production
-/build
-
-# testing
-/coverage
+/.astro/
 
 # misc
 .DS_Store
 .env
-.env.local
-.env.development.local
-.env.test.local
-.env.production.local
-
-npm-debug.log*
-yarn-debug.log*
-yarn-error.log*
+.env.*
 
 # typescript
 *.tsbuildinfo
-next-env.d.ts
 
 # docs
 /docs