Update docs (#2774)

* Update TopBar docs (animateHide -> animate)

* Update BottomTabs docs (animateHide -> animate)

* Update Navigation.push docs

* docs/installation-android: remove "@Nullable" annotation

* Docs/SideMenu: Add 'center' prop

docs/docs/SideMenu.md

 | Name | Type |
 | --- | --- |
 | left | <a href="https://wix.github.io/react-native-navigation/v2/#/docs/Component">Component</a> | 
+| center | <a href="https://wix.github.io/react-native-navigation/v2/#/docs/Component">Component</a> | 
 | right | <a href="https://wix.github.io/react-native-navigation/v2/#/docs/Component">Component</a> | 
 

docs/docs/installation-android.md

 		return BuildConfig.DEBUG;
 	}
 
-	@Nullable
 	@Override
 	public List<ReactPackage> createAdditionalReactPackages() {
 		return Arrays.<ReactPackage>asList(

docs/docs/options/BottomTabs.md

 | currentTabId | <code>string</code> | 
 | currentTabIndex | <code>number</code> | 
 | hidden | <code>boolean</code> | 
-| animateHide | <code>boolean</code> | 
+| animate | <code>boolean</code> | 
 | testID | <code>string</code> | 
 | drawUnder | <code>boolean</code> | 
 

docs/docs/options/TopBar.md

 | textFontFamily | <code>string</code> | 
 | testID | <code>string</code> | 
 | hidden | <code>boolean</code> | 
-| animateHide | <code>boolean</code> | 
+| animate | <code>boolean</code> | 
 | hideOnScroll | <code>boolean</code> | 
 | transparent | <code>boolean</code> | 
 | translucent | <code>boolean</code> | 

docs/docs/usage.md

 
 ```js
 Navigation.push(this.props.componentId, {
-  name: 'navigation.playground.PushedScreen',
-  passProps: {}
+  component: {
+    name: 'navigation.playground.PushedScreen',
+    passProps: {}
+  }
 });
 ```
 ### pop(componentId)