Improve lightbox... and update to React Native 0.71.0 (#49)

* Switch to a better lightbox implementation (close #42)

* Upgrade to react-native 0.71.0

* Update (or remove low-value) tests

android/gradle.properties

@@ -38,3 +38,7 @@ reactNativeArchitectures=armeabi-v7a,arm64-v8a,x86,x86_64
 # to write custom TurboModules/Fabric components OR use libraries that
 # are providing them.
 newArchEnabled=false
+
+# Use this property to enable or disable the Hermes JS engine.
+# If set to false, you will be using JSC instead.
+hermesEnabled=true