feat: Integrate shadcn/ui and update styling

This commit introduces shadcn/ui for enhanced component management and updates global styling. It also adds new dependencies for UI components and typography, improving the overall look and feel of the application. Key changes include:

- Integration of shadcn/ui for component development.
- Application of Geist Variable font and updated CSS variables for theming.
- Inclusion of `embla-carousel` for improved testimonial display.
- Refinement of `index.css` for better styling consistency.
- Updated `tsconfig.json` and `vite.config.ts` for alias configurations.

vite.config.ts

@@ -12,7 +12,7 @@ export default defineConfig(({mode}) => {
     },
     resolve: {
       alias: {
-        '@': path.resolve(__dirname, '.'),
+        '@': path.resolve(__dirname, './src'),
       },
     },
     server: {