refactor: remove unused stuff, fix lint warnings

app/src/main/res/drawable/baseline_more_horiz_24.xml

@@ -1,11 +0,0 @@
-<vector xmlns:android="http://schemas.android.com/apk/res/android"
-    android:height="24dp"
-    android:viewportHeight="24"
-    android:viewportWidth="24"
-    android:width="24dp">
-
-    <path
-        android:fillColor="?android:textColor"
-        android:pathData="M6,10c-1.1,0 -2,0.9 -2,2s0.9,2 2,2 2,-0.9 2,-2 -0.9,-2 -2,-2zM18,10c-1.1,0 -2,0.9 -2,2s0.9,2 2,2 2,-0.9 2,-2 -0.9,-2 -2,-2zM12,10c-1.1,0 -2,0.9 -2,2s0.9,2 2,2 2,-0.9 2,-2 -0.9,-2 -2,-2z" />
-
-</vector>

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

@@ -1,10 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<vector xmlns:android="http://schemas.android.com/apk/res/android"
-    android:width="108dp"
-    android:height="108dp"
-    android:viewportWidth="108"
-    android:viewportHeight="108">
-    <path
-        android:fillColor="#252827"
-        android:pathData="M0,0h108v108h-108z" />
-</vector>

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

@@ -1,6 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!-- https://stackoverflow.com/a/30692466 -->
-<shape xmlns:android="http://schemas.android.com/apk/res/android"
-    android:shape="rectangle">
-    <corners android:radius="10dp" />
-</shape>