Add missing debug icon in the app launcher

mobile/src/debug/AndroidManifest.xml

@@ -1,30 +1,23 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:tools="http://schemas.android.com/tools"
-  package="com.alexstyl.specialdates"
-  android:installLocation="auto">
-
+  package="com.alexstyl.specialdates">
 
   <application
     android:name="com.alexstyl.specialdates.DebugApplication"
-    android:allowBackup="true"
-    android:icon="@mipmap/ic_launcher"
-    android:label="@string/localised_app_name"
-    android:theme="@style/Theme.Memento.BloodyCherry"
     tools:replace="android:name">
 
     <activity
       android:name="com.alexstyl.specialdates.debug.DebugActivity"
       android:icon="@drawable/ic_heart"
       android:label="Memento Debug"
-      android:taskAffinity="com.alexstyl.debug"
-      android:theme="@style/Theme.AppCompat.Light.NoActionBar">
+      android:taskAffinity="com.alexstyl.debug">
       <intent-filter>
+        <action android:name="android.intent.action.MAIN" />
         <category android:name="android.intent.category.LAUNCHER" />
       </intent-filter>
     </activity>
 
-    <activity android:name=".debug.MixingColorsActivity" />
   </application>
 
 </manifest>

mobile/src/main/res/xml/preference_debug.xml

@@ -15,13 +15,4 @@
     android:key="@string/key_debug_start_calendar"
     android:title="Start Calendar Intent" />
 
-  <Preference
-    android:key="@string/key_debug_animation_playground"
-    android:title="Animation Playground">
-    <intent
-      android:action="android.intent.action.VIEW"
-      android:targetClass="com.alexstyl.specialdates.birthdaycard.AnimationPlayground"
-      android:targetPackage="com.alexstyl.specialdates" />
-  </Preference>
-
 </PreferenceScreen>