Remove obsolete react-native version of Android app

android/build.gradle

@@ -1,77 +0,0 @@
-/*
- * Copyright (C) 2016-2019 Álinson Santos Xavier <isoron@gmail.com>
- *
- * This file is part of Loop Habit Tracker.
- *
- * Loop Habit Tracker is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by the
- * Free Software Foundation, either version 3 of the License, or (at your
- * option) any later version.
- *
- * Loop Habit Tracker is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
- * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-buildscript {
-    ext.kotlin_version = '1.3.11'
-    repositories {
-        google()
-        jcenter()
-    }
-    dependencies {
-        classpath 'com.android.tools.build:gradle:3.3.0'
-        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
-    }
-}
-
-allprojects {
-    repositories {
-        google()
-        jcenter()
-        maven {
-            url "$rootDir/../react-native/node_modules/react-native/android"
-        }
-    }
-}
-
-apply plugin: 'com.android.application'
-apply plugin: 'kotlin-android'
-apply plugin: 'kotlin-android-extensions'
-
-android {
-    compileSdkVersion 28
-    defaultConfig {
-        applicationId "org.isoron.habits"
-        minSdkVersion 21
-        targetSdkVersion 28
-        versionCode 1
-        versionName "1.0"
-        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
-    }
-    buildTypes {
-        release {
-            minifyEnabled false
-            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
-        }
-    }
-}
-
-dependencies {
-    implementation fileTree(dir: 'libs', include: ['*.jar'])
-    implementation"org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
-    implementation 'com.android.support:appcompat-v7:28.0.0'
-    implementation files("../core/build/libs/core-jvm.jar")
-    implementation "com.facebook.react:react-native:0.57.8"
-    implementation 'org.sqldroid:sqldroid:1.0.3'
-    implementation project(':react-native-svg')
-
-    testImplementation 'junit:junit:4.12'
-
-    androidTestImplementation 'com.android.support.test:runner:1.0.2'
-    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
-}