mobile splash generated assets cleanup

Author: julian-CStack

android/app/src/main/res/drawable-night-v21/background.png

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <item>
+        <bitmap android:gravity="fill" android:src="@drawable/background"/>
+    </item>
+    <item>
+        <bitmap android:gravity="center" android:src="@drawable/splash"/>
+    </item>
+</layer-list>

android/app/src/main/res/drawable-night-v21/launch_background.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <item>
+        <bitmap android:gravity="fill" android:src="@drawable/background"/>
+    </item>
+    <item>
+        <bitmap android:gravity="center" android:src="@drawable/splash"/>
+    </item>
+</layer-list>

android/app/src/main/res/drawable-night/background.png

@@ -6,7 +6,7 @@
         <item name="android:windowFullscreen">false</item>
         <item name="android:windowDrawsSystemBarBackgrounds">false</item>
         <item name="android:windowLayoutInDisplayCutoutMode">shortEdges</item>
-        <item name="android:windowSplashScreenBackground">#F7F7F7</item>
+        <item name="android:windowSplashScreenBackground">#2A2D34</item>
     </style>
     <!-- Theme applied to the Android Window as soon as the process has started.
          This theme determines the color of the Android Window while your

android/app/src/main/res/drawable-night/launch_background.xml

@@ -2,16 +2,17 @@
   "images" : [
     {
       "filename" : "background.png",
-      "idiom" : "universal",
-      "scale" : "1x"
+      "idiom" : "universal"
     },
     {
-      "idiom" : "universal",
-      "scale" : "2x"
-    },
-    {
-      "idiom" : "universal",
-      "scale" : "3x"
+      "appearances" : [
+        {
+          "appearance" : "luminosity",
+          "value" : "dark"
+        }
+      ],
+      "filename" : "darkbackground.png",
+      "idiom" : "universal"
     }
   ],
   "info" : {