feat: link and directory improvements

Changing pages now happens via Link, directory has gotten a layout change with app becoming a starting point and every page requireing their own .tsx and .css file.
Components have also been added where reocurring componennts can be made and reapplied in the project.

ref: N25B-96

package.json

@@ -11,7 +11,8 @@
   },
   "dependencies": {
     "react": "^19.1.1",
-    "react-dom": "^19.1.1"
+    "react-dom": "^19.1.1",
+    "react-router": "^7.9.3"
   },
   "devDependencies": {
     "@eslint/js": "^9.36.0",