Align and enable autosizing for the app name text view in drawer header

- Use a proper drop up/down arrow icon.
- Move selected service views for better visibility.
- Show the selected service icon next to its name.
- Add a subtle fade background to the service name/icon for better
readability.

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

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android">
+    <gradient
+        android:angle="90"
+        android:endColor="#00000000"
+        android:startColor="#4D000000"/>
+</shape>