Revert "WIP"

This reverts commit a0e5e77dcb.

app/src/main/res/navigation/app_nav_graph.xml

@@ -1,15 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<navigation xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:app="http://schemas.android.com/apk/res-auto"
-    android:id="@+id/app_nav_graph"
-    app:startDestination="@id/placeholder">
-
-    <include app:graph="@navigation/ui_home_nav_graph" />
-    <fragment android:id="@+id/placeholder" >
-        <action
-            android:id="@+id/action_placeholder_to_ui_home_nav_graph"
-            app:destination="@id/ui_home_nav_graph" />
-    </fragment>
-
-
-</navigation>