feat(Materials): add new materials navigation and href functions

- Introduced href functions for accessing materials, including hrefMaterials, hrefMaterialSubject, and hrefMaterialDetail.
- Updated AppsScreen to include a new entry for materials, enhancing the app's educational resources section.
- Exported material types in index.ts to support the new materials functionality.

app/(app)/(tabs)/apps/materials/index.tsx

@@ -0,0 +1,5 @@
+import { MaterialsScreen } from '../../../../../src/screens/material';
+
+export default function MaterialsRoute() {
+  return <MaterialsScreen />;
+}