Temporarily comment out the graph space in the main activity until we can get it fully working.

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

@@ -119,13 +119,11 @@
 
     </LinearLayout>
 
-    <!--
     <com.github.mikephil.charting.charts.LineChart
         android:id="@+id/chart"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:visibility="invisible" />
-    -->
 
     <ScrollView
         android:id="@+id/scrollView"