refactor: standardize code formatting across components and utilities

- Updated formatting in SiteFooter and SiteHeader components for consistency.
- Refactored Badge, Button, Card, Separator components to improve readability.
- Enhanced markdown parsing logic in announcements and markdown utility functions.
- Adjusted ESLint configuration for better code quality checks.
- Added biome.json for BiomeJS configuration.
- Updated package.json and configuration files for improved dependency management.

postcss.config.mjs

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