[Docs] Remove sections on AnimationExperimental and Pop

AnimationExperimental has been removed and Pop has been superseded by Animated.

docs/Animations.md

@@ -556,79 +556,3 @@ var CustomSceneConfig = Object.assign({}, BaseConfig, {
 
 For further information about customizing scene transitions, [read the
 source](https://github.com/facebook/react-native/blob/master/Libraries/CustomComponents/Navigator/NavigatorSceneConfigs.js).
-
-### AnimationExperimental *(Deprecated)*
-
-As the name would suggest, this was only ever an experimental API and it
-is **not recommended to use this on your apps**. It has some rough edges
-and is not under active development. It is built on top of CoreAnimation
-explicit animations.
-
-If you choose to use it anyways, here is what you need to know:
-
-- You will need to include `RCTAnimationExperimental.xcodeproj` and add
-  `libRCTAnimationExperimental.a` to `Build Phases`.
-- Suited only for static "fire and forget" animations - not continuous gestures.
-- Hit detection will not work as expected because animations occur on
-  the presentation layer.
-
-```javascript
-var AnimationExperimental = require('AnimationExperimental');
-
-var App = React.createClass({
-  componentDidMount() {
-    AnimationExperimental.startAnimation(
-      {
-        node: this._box,
-        duration: 1000,
-        easing: 'easeInOutBack',
-        property: 'scaleXY',
-        toValue: { x: 1, y: 1 },
-      },
-    );
-  },
-
-  render() {
-    return (
-      <View style={{flex: 1, justifyContent: 'center', alignItems: 'center'}}>
-        <View ref={component => this._box = component}
-              style={{width: 200, height: 200, backgroundColor: 'red'}} />
-      </View>
-    )
-  },
-});
-```
-![](/react-native/img/AnimationExperimentalScaleXY.gif)
-
-Now to demonstrate a known issue, and one of the reasons why it is
-recommended not to use `AnimationExperimental` currently, let's try to
-animate `opacity` from 1 to 0.5:
-
-```javascript
-AnimationExperimental.startAnimation(
-  {
-    node: this._box,
-    duration: 1000,
-    easing: 'easeInOutBack',
-    property: 'opacity',
-    fromValue: 1,
-    toValue: 0.5,
-  },
-);
-```
-
-![](/react-native/img/AnimationExperimentalOpacity.gif)
-
-### Pop *(Unsupported, not recommended)*
-
-[Facebook Pop](https://github.com/facebook/pop) "supports spring and
-decay dynamic animations, making it useful for building realistic,
-physics-based interactions."
-
-This is not officially supported or recommended because the direction is
-to move towards JavaScript-driven animations, but if you must use it,
-you can find the code to integrate with React Native
-[here](https://github.com/facebook/react-native/issues/1365#issuecomment-104792251).
-Please do not open questions specific to Pop on the React Native issues,
-StackOverflow is a better place to answer those questions as it is not
-considered to be part of the core.