Update images in README with new screenshots

Author: imbissbudenaesthetik

README.md

@@ -15,10 +15,10 @@
  </p>
 
 <p align="center">
-  <img src="https://imgur.com/o3vOjmo.png" width=200px>
+  <img src="https://github.com/seemoo-lab/AirGuard/raw/main/fastlane/metadata/android/en-US/images/phoneScreenshots/1_en-US.png" width=200px>
+  <img src="https://github.com/seemoo-lab/AirGuard/raw/main/fastlane/metadata/android/en-US/images/phoneScreenshots/2_en-US.png" width=200px>
   <img src="https://github.com/seemoo-lab/AirGuard/raw/main/fastlane/metadata/android/en-US/images/phoneScreenshots/3_en-US.png" width=200px>
-  <img src="https://imgur.com/N7o6ZPr.png" width=200px>
-  <img src="https://imgur.com/7UgadbH.png" width=200px>
+  <img src="https://github.com/seemoo-lab/AirGuard/raw/main/fastlane/metadata/android/en-US/images/phoneScreenshots/4_en-US.png" width=200px>
 </p>
 
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