Update chat window android version, remove old sample app images (#1558)

Author: nomyzs

src/pages/getting-started/installing-livechat/android-widget/index.mdx

@@ -52,7 +52,7 @@ To add the dependency, use the following code:
 
 ```js
 dependencies {
-    implementation 'com.github.livechat:chat-window-android:v2.4.6'
+    implementation 'com.github.livechat:chat-window-android:v2.5.0'
 }
 ```
 
@@ -281,26 +281,6 @@ You can refer to our sample `app` in the module. There are examples for three us
 - Embedded chat widget launched from a Fragment
 - Starting ChatWindowActivity (with limited capabilities)
 
-<div style={{ width: "200px" }}>
-  <img
-    src="https://cdnx.livechatinc.com/developers/uploads/2017/08/android-app-2.jpg"
-    title="In app widget example"
-    alt="In app widget example"
-    width="200px"
-    height="400px"
-  />
-</div>
-
-<div style={{ width: "200px" }}>
-  <img
-    src="https://cdnx.livechatinc.com/developers/uploads/2017/08/android-app-1.jpg"
-    title="In app widget example"
-    alt="In app widget example"
-    width="200px"
-    height="400px"
-  />
-</div>
-
 Possible use-cases include: adding a chat button to your “Contact us” screen or displaying a chat button all the time within the app. Read more about [providing in-app support](http://www.livechat.com/blog/2013/10/new-approach-to-in-app-support/) in mobile applications.
 
 # Sample usage