Remove pngs

app/src/main/res/drawable/ic_sms_gray_24dp.xml

@@ -0,0 +1,10 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="48dp"
+    android:height="48dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24"
+    android:tint="?attr/colorControlNormal">
+  <path
+      android:fillColor="@android:color/white"
+      android:pathData="M20,2L4,2c-1.1,0 -2,0.9 -2,2v18l4,-4h14c1.1,0 2,-0.9 2,-2L22,4c0,-1.1 -0.9,-2 -2,-2zM20,16L5.17,16L4,17.17L4,4h16v12zM7,9h2v2L7,11zM15,9h2v2h-2zM11,9h2v2h-2z"/>
+</vector>

app/src/main/res/layout/main_activity.xml

@@ -21,7 +21,7 @@
             android:id="@+id/main_no_subscriptions">
         <ImageView
                 android:layout_width="match_parent"
-                android:layout_height="wrap_content" app:srcCompat="@drawable/ic_sms_black_48dp"
+                android:layout_height="wrap_content" app:srcCompat="@drawable/ic_sms_gray_48dp"
                 android:id="@+id/main_no_subscriptions_image"/>
         <TextView
                 android:id="@+id/main_no_subscriptions_text"

app/src/main/res/layout/main_fragment_item.xml

@@ -6,7 +6,7 @@
               android:orientation="horizontal" android:clickable="true" android:focusable="true">
     <ImageView
             android:layout_width="35dp"
-            android:layout_height="match_parent" app:srcCompat="@drawable/outline_sms_24"
+            android:layout_height="match_parent" app:srcCompat="@drawable/ic_sms_gray_24dp"
             android:id="@+id/topic_image" android:layout_marginStart="20dp"/>
     <LinearLayout
             android:orientation="vertical"