Slightly improve welcome screen

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

@@ -0,0 +1,11 @@
+<vector
+	xmlns:android="http://schemas.android.com/apk/res/android"
+	android:width="24dp"
+	android:height="24dp"
+	android:tint="?attr/colorControlNormal"
+	android:viewportWidth="24.0"
+	android:viewportHeight="24.0">
+	<path
+		android:fillColor="@android:color/white"
+		android:pathData="M12 2C13.1 2 14 2.9 14 4S13.1 6 12 6 10 5.1 10 4 10.9 2 12 2M15.9 8.1C15.5 7.7 14.8 7 13.5 7H11C8.2 7 6 4.8 6 2H4C4 5.2 6.1 7.8 9 8.7V22H11V16H13V22H15V10.1L19 14L20.4 12.6L15.9 8.1Z" />
+</vector>

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

@@ -31,7 +31,9 @@
 				android:layout_marginHorizontal="@dimen/margin_normal"
 				android:singleLine="true"
 				android:text="@string/welcome"
-				android:textAppearance="?textAppearanceTitleSmall" />
+				android:textAppearance="?textAppearanceTitleLarge"
+				android:drawablePadding="16dp"
+				app:drawableStartCompat="@drawable/ic_welcome" />
 
 			<HorizontalScrollView
 				android:layout_width="match_parent"