feat: initial portfolio implementation with dark mode and i18n

- Add Astro portfolio with TypeScript
- Implement dark/light theme toggle
- Add Spanish/English translations
- Create under construction page
- Style with Tailwind CSS and glassmorphism effects
- Add profile image, projects, skills, and experience sections

astro.config.mjs

@@ -1,5 +1,11 @@
 // @ts-check
 import { defineConfig } from 'astro/config';
 
+import tailwindcss from '@tailwindcss/vite';
+
 // https://astro.build/config
-export default defineConfig({});
+export default defineConfig({
+  vite: {
+    plugins: [tailwindcss()]
+  }
+});