fix: Add build script and fix manifest

- Add build-apk.sh for easy compilation
- Simplify AndroidManifest.xml
- Fix themes.xml to use basic Android themes
- Enable BuildConfig
- Add okhttp-dnsoverhttps dependency

android-sdk/platforms/android-34/data/res/drawable/ic_minus.xml

@@ -0,0 +1,24 @@
+<!--
+     Copyright (C) 2018 The Android Open Source Project
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:height="24.0dp"
+        android:viewportHeight="24.0"
+        android:viewportWidth="24.0"
+        android:width="24.0dp" >
+    <path
+        android:fillColor="#FFFFFFFF"
+        android:pathData="M18,13H6c-0.55,0 -1,-0.45 -1,-1v0c0,-0.55 0.45,-1 1,-1h12c0.55,0 1,0.45 1,1v0C19,12.55 18.55,13 18,13z"/>
+</vector>