chore: remove web icons and cleanup config file

Author: Nirajn2311

Diff for: mobile-app/android/app/src/main/res/values/colors.xml

@@ -1,4 +1,4 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
-    <color name="ic_launcher_background">#ed1e79</color>
+    <color name="ic_launcher_background">#0a0a23</color>
 </resources>

Diff for: mobile-app/flutter_launcher_icons.yaml

@@ -1,16 +1,12 @@
 # flutter pub run flutter_launcher_icons
 flutter_launcher_icons:
-  ios: true
-  android: true
-  # image_path_android: "assets/icon/icon.png"
-  min_sdk_android: 21 # android min sdk min:16, default 21
   image_path: "assets/icon/icon.png"
+
+  # Android
+  android: true
+  min_sdk_android: 22
   adaptive_icon_background: "#0a0a23"
   adaptive_icon_foreground: "assets/icon/icon.png"
-  # adaptive_icon_monochrome: "assets/icon/monochrome.png"
 
-  # image_path_ios: "assets/icon/icon.png"
-  remove_alpha_channel_ios: true
-  # image_path_ios_dark_transparent: "assets/icon/icon_dark.png"
-  # image_path_ios_tinted_grayscale: "assets/icon/icon_tinted.png"
-  # desaturate_tinted_to_grayscale_ios: true
+  # iOS
+  ios: true