feat: update dependencies and add new styles

- Added node and sass to dependencies in package.json
- Added @types/node to devDependencies
- Removed unused CSS files and replaced them with SCSS files
- Updated import paths in App.tsx and Blog.tsx to use new aliasing
- Configured TypeScript paths for easier imports
- Updated Vite config to include path aliases
- Created new SCSS files for About, Blog, Error, and Main styles
- Added a variables file for color and effect variables
- Updated index.scss for global styles and responsive adjustments

src/pages/BlogPost.tsx

@@ -3,7 +3,6 @@ import { useParams, Link } from 'react-router-dom';
 import { blogPostsData } from '../data/blogPostsData';
 import { NotFound } from './NotFound';
 
-import './BlogPost.module.css';
 
 export const BlogPost = () => {
   const { slug } = useParams<{ slug: string }>();