fix(animation): replace useAnimatedValue with Animated.Value to fix runtime error

Removed `useAnimatedValue` import from `react-native` and replaced
`useAnimatedValue(0)` with `new Animated.Value(0)`.

Reason:
`useAnimatedValue` is not available in the current React Native version,
causing the runtime error:

TypeError: (0, _reactNative.useAnimatedValue) is not a function

Using `Animated.Value` restores compatibility with the Animated API and
keeps the fade animation working correctly.

Author: guilhermeholm

website/versioned_docs/version-0.85/animated.md

@@ -23,12 +23,11 @@ import {
   View,
   StyleSheet,
   Button,
-  useAnimatedValue,
 } from 'react-native';
 
 const App = () => {
   // fadeAnim will be used as the value for opacity. Initial Value: 0
-  const fadeAnim = useAnimatedValue(0);
+  const fadeAnim = new Animated.Value(0);
 
   const fadeIn = () => {
     // Will change fadeAnim value to 1 in 5 seconds