feat: initialize Astro project with Tailwind and TypeScript

- Astro 5.0 with TypeScript strict mode
- Tailwind CSS 3.4 configured with custom design system
- Project structure created (components, layouts, content, styles)
- Sitemap and RSS integrations added
- Build verified successfully

Fixes dependency conflict by using Astro 5 instead of 6

package.json

@@ -0,0 +1,25 @@
+{
+  "name": "davidaragon-portfolio",
+  "type": "module",
+  "version": "0.0.1",
+  "engines": {
+    "node": ">=18.14.1"
+  },
+  "scripts": {
+    "dev": "astro dev",
+    "build": "astro build",
+    "preview": "astro preview",
+    "astro": "astro"
+  },
+  "dependencies": {
+    "astro": "^5.0.0",
+    "zod": "^3.23.8"
+  },
+  "devDependencies": {
+    "@astrojs/rss": "^4.0.18",
+    "@astrojs/sitemap": "^3.7.2",
+    "@astrojs/tailwind": "^6.0.2",
+    "tailwindcss": "^3.4.17",
+    "@tailwindcss/typography": "^0.5.15"
+  }
+}