docs: remove unused assets

Author: pd4d10

README.md

@@ -3,7 +3,7 @@
 An open-source mobile app for Git services including GitHub, GitLab, Bitbucket and Gitea, built with Flutter
 
 <p>
-  <a href="https://apps.apple.com/us/app/gittouch/id1452042346?itsct=apps_box&amp;itscg=30200"><img src="https://tools.applemediaservices.com/api/badges/download-on-the-app-store/black/en-US?size=250x83&amp;releaseDate=1550016000&h=bd931187056e3cd07dc211040a0115e5" alt="Download on the App Store" height="60"></a>
+  <a href="https://apps.apple.com/us/app/gittouch/id1452042346?itsct=apps_box&itscg=30200"><img src="https://tools.applemediaservices.com/api/badges/download-on-the-app-store/black/en-US" alt="Download on the App Store" height="60"></a>
   <a href="https://play.google.com/store/apps/details?id=io.github.pd4d10.gittouch"><img alt="Get it on Google Play" title="Google Play" src="https://raw.githubusercontent.com/pd4d10/git-touch/master/assets/google-play-badge.png" height="60" /></a>
 </p>
 
@@ -13,16 +13,10 @@ Click badges above to install it from Apple App Store or Google Play.
 
 Android users can also download APK file from [release page](https://github.com/pd4d10/git-touch/releases) and install it manually.
 
-A beta channel is available if you want to get the latest features:
-
-- iOS: https://testflight.apple.com/join/hAYijLr5
-- Android: https://play.google.com/apps/testing/io.github.pd4d10.gittouch
-
 ## Screenshots
 
 <p>
-  <img src="assets/screenshot-dark.png" alt="Dark screenshot" width="400" />
-  <img src="assets/screenshot-light.png" alt="Light screenshot" width="400" />
+  <img src="assets/screenshot-dark.png" alt="Dark screenshot" width="400" /><img src="assets/screenshot-light.png" alt="Light screenshot" width="400" />
 </p>
 
 ## Supported platforms
@@ -47,7 +41,7 @@ See [CONTRIBUTING.md](./CONTRIBUTING.md).
 
 ## Contributors
 
-[ ![](https://sourcerer.io/fame/pd4d10/pd4d10/git-touch/images/0) ![](https://sourcerer.io/fame/pd4d10/pd4d10/git-touch/images/1) ![](https://sourcerer.io/fame/pd4d10/pd4d10/git-touch/images/2) ![](https://sourcerer.io/fame/pd4d10/pd4d10/git-touch/images/3) ![](https://sourcerer.io/fame/pd4d10/pd4d10/git-touch/images/4) ![](https://sourcerer.io/fame/pd4d10/pd4d10/git-touch/images/5) ![](https://sourcerer.io/fame/pd4d10/pd4d10/git-touch/images/6) ![](https://sourcerer.io/fame/pd4d10/pd4d10/git-touch/images/7) ](https://github.com/pd4d10/git-touch/graphs/contributors)
+[![](https://sourcerer.io/fame/pd4d10/pd4d10/git-touch/images/0)![](https://sourcerer.io/fame/pd4d10/pd4d10/git-touch/images/1)![](https://sourcerer.io/fame/pd4d10/pd4d10/git-touch/images/2)![](https://sourcerer.io/fame/pd4d10/pd4d10/git-touch/images/3)![](https://sourcerer.io/fame/pd4d10/pd4d10/git-touch/images/4)![](https://sourcerer.io/fame/pd4d10/pd4d10/git-touch/images/5)![](https://sourcerer.io/fame/pd4d10/pd4d10/git-touch/images/6)![](https://sourcerer.io/fame/pd4d10/pd4d10/git-touch/images/7)](https://github.com/pd4d10/git-touch/graphs/contributors)
 
 ## License