feat: add react-router-dom for routing and implement plugin detail view

- Updated package.json to include react-router-dom dependency.
- Refactored App component to use React Router for navigation.
- Created PluginDetail component to display detailed information about a selected plugin.
- Added fetch functions for releases and commits in the server code.
- Enhanced UI with new styles for dark mode and improved layout.
- Implemented caching for API responses to optimize performance.

package.json

@@ -13,7 +13,8 @@
     "dependencies": {
         "express": "^4.19.2",
         "react": "^18.2.0",
-        "react-dom": "^18.2.0"
+        "react-dom": "^18.2.0",
+        "react-router-dom": "^6.23.1"
     },
     "devDependencies": {
         "@vitejs/plugin-react": "^4.2.0",