Refactor styles and restructure CSS files

- Removed App.css and migrated styles to individual component and page-specific CSS files.
- Created base styles in base.css for layout utilities and common elements.
- Added component-specific styles in cards.css, header.css, and other relevant files.
- Updated imports in App.tsx and other components to reflect new CSS structure.
- Enhanced responsiveness and visual consistency across various components and pages.

src/pages/About.tsx

@@ -1,6 +1,7 @@
 import { motion } from "framer-motion";
 import VisitedMap from "../components/VisitedMap";
 import BioSection from "../components/BioSection";
+import "../styles/pages/about.css";
 
 const ABOUT_TEXT = "Hi! I'm Sasha Bayda, a passionate developer focused on creating beautiful and functional web experiences. With a background in computer science and a keen eye for design, I strive to bridge the gap between technology and user-centric solutions. When I'm not coding, you can find me exploring the outdoors, experimenting with new recipes, or indulging in photography. Feel free to explore my projects and get in touch if you'd like to collaborate or learn more about my work!" + "\n\n" + "Thank you for visiting my digital resume site. I look forward to connecting with you!";