Serve ui out of local html files; pass text/plain and image/* data to the webview using a data url

android/app/src/main/AndroidManifest.xml

@@ -3,6 +3,7 @@
     package="com.mozilla.send.sendandroid">
 
     <uses-permission android:name="android.permission.INTERNET"/>
+    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
 
     <application
         android:allowBackup="true"
@@ -17,8 +18,6 @@
 
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
-        </activity>
-        <activity android:name=".IntentActivity">
             <intent-filter>
                 <action android:name="android.intent.action.SEND" />
                 <category android:name="android.intent.category.DEFAULT" />
@@ -30,7 +29,6 @@
                 <data android:mimeType="text/plain" />
             </intent-filter>
         </activity>
-
     </application>
 
 </manifest>