Mobile/install guide (#90)

* New sliverbar asset & app icon

* Purple accent color in match of webapp, new sliverbar background

* Changed drawer top image

* Added card with link to setup guide

* SliverAppBar title dissapears when collapsed

* renamed setup guide button

Co-authored-by: Mathieu Bélanger <[email protected]>

Author: mateobelanger

mobile/android/app/src/main/AndroidManifest.xml

@@ -50,4 +50,4 @@
             android:value="2" />
     </application>
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
-</manifest>
+</manifest>