Convert dangrubb.net to Astro framework

- Migrated main site, blog, CV, and music sections to Astro
- Component-based architecture with layouts
- JSON-based blog posts
- Static site generation
- Preserved original styling and functionality

tsconfig.json

@@ -0,0 +1,5 @@
+{
+  "extends": "astro/tsconfigs/strict",
+  "include": [".astro/types.d.ts", "**/*"],
+  "exclude": ["dist"]
+}