remove unused components and files to clean up the project structure

app/+not-found.tsx

@@ -1,33 +0,0 @@
-import { Link, Stack } from 'expo-router';
-import React from 'react';
-import { StyleSheet } from 'react-native';
-
-import { ThemedText } from '@/components/ThemedText';
-import { ThemedView } from '@/components/ThemedView';
-
-export default function NotFoundScreen() {
-  return (
-    <>
-      <Stack.Screen options={{ title: 'Oops!' }} />
-      <ThemedView style={styles.container}>
-        <ThemedText type="title">This screen does not exist.</ThemedText>
-        <Link href="/" style={styles.link}>
-          <ThemedText type="link">Go to home screen!</ThemedText>
-        </Link>
-      </ThemedView>
-    </>
-  );
-}
-
-const styles = StyleSheet.create({
-  container: {
-    flex: 1,
-    alignItems: 'center',
-    justifyContent: 'center',
-    padding: 20,
-  },
-  link: {
-    marginTop: 15,
-    paddingVertical: 15,
-  },
-});