chore: update dependencies and add postcss configuration

- Updated Next.js to version 16.2.4
- Updated Tailwind CSS and PostCSS to their latest versions
- Added autoprefixer to PostCSS configuration
- Created a .dockerignore file to exclude unnecessary files from Docker context

postcss.config.mjs

@@ -1,7 +1,8 @@
 const config = {
   plugins: {
     "@tailwindcss/postcss": {},
+    autoprefixer: {},
   },
 };
 
-export default config;
+export default config;