chore: Created new assets folder, added video for 'headerBackButtonMenuEnabled' option

Author: stanleyoos

static/assets/7.x/native-stack/native-stack-animation-default.mp4 renamed to static/assets/7.x/native-stack/animation/native-stack-animation-default.mp4

@@ -166,6 +166,10 @@ Requires `react-native-screens` version >=3.3.0.
 
 Only supported on iOS.
 
+  <video playsInline autoPlay muted loop>
+   <source src="/assets/7.x/native-stack/headerBackButtonMenuEnabled/headerBackButtonMenuEnabled.mp4" />
+  </video>
+
 #### `headerBackVisible`
 
 Whether the back button is visible in the header. You can use it to show a back button alongside `headerLeft` if you have specified it.
@@ -606,47 +610,47 @@ Supported values:
 
 - `default`: use the platform default animation
   <video playsInline autoPlay muted loop>
-  <source src="/assets/7.x/native-stack/native-stack-animation-default.mp4" />
+  <source src="/assets/7.x/native-stack/animation/native-stack-animation-default.mp4" />
   </video>
 
 - `fade`: fade screen in or out
   <video playsInline autoPlay muted loop>
-   <source src="/assets/7.x/native-stack/native-stack-animation-fade.mp4" />
+   <source src="/assets/7.x/native-stack/animation/native-stack-animation-fade.mp4" />
   </video>
 
 - `fade_from_bottom`: fade the new screen from bottom
   <video playsInline autoPlay muted loop>
-   <source src="/assets/7.x/native-stack/native-stack-animation-fade-from-bottom.mp4" />
+   <source src="/assets/7.x/native-stack/animation/native-stack-animation-fade-from-bottom.mp4" />
   </video>
 
 - `flip`: flip the screen, requires `presentation: "modal"` (iOS only)
   <video playsInline autoPlay muted loop>
-   <source src="/assets/7.x/native-stack/native-stack-animation-flip.mp4" />
+   <source src="/assets/7.x/native-stack/animation/native-stack-animation-flip.mp4" />
   </video>
 
 - `simple_push`: default animation, but without shadow and native header transition (iOS only, uses default animation on Android)
   <video playsInline autoPlay muted loop>
-   <source src="/assets/7.x/native-stack/native-stack-animation-simple-push.mp4" />
+   <source src="/assets/7.x/native-stack/animation/native-stack-animation-simple-push.mp4" />
   </video>
 
 - `slide_from_bottom`: slide in the new screen from bottom
   <video playsInline autoPlay muted loop>
-   <source src="/assets/7.x/native-stack/native-stack-animation-slide-from-bottom.mp4" />
+   <source src="/assets/7.x/native-stack/animation/native-stack-animation-slide-from-bottom.mp4" />
   </video>
 
 - `slide_from_right`: slide in the new screen from right (Android only, uses default animation on iOS)
   <video playsInline autoPlay muted loop>
-   <source src="/assets/7.x/native-stack/native-stack-animation-slide-from-right.mp4" />
+   <source src="/assets/7.x/native-stack/animation/native-stack-animation-slide-from-right.mp4" />
   </video>
 
 - `slide_from_left`: slide in the new screen from left (Android only, uses default animation on iOS)
   <video playsInline autoPlay muted loop>
-   <source src="/assets/7.x/native-stack/native-stack-animation-slide-from-left.mp4" />
+   <source src="/assets/7.x/native-stack/animation/native-stack-animation-slide-from-left.mp4" />
   </video>
 
 - `none`: don't animate the screen
   <video playsInline autoPlay muted loop>
-   <source src="/assets/7.x/native-stack/native-stack-animation-none.mp4" />
+   <source src="/assets/7.x/native-stack/animation/native-stack-animation-none.mp4" />
   </video>
 
 #### `presentation`