feat(rn) update React Native to version 0.63

I'm updating to RN 0.63 instead of the latest (0.66 at the time of this writing)
so we can update the navigation related libraries to their latest versions, and
then proceed with the larger leap towards the latest RN.

react-native.config.js

@@ -0,0 +1,12 @@
+/**
+ * This is needed because the RN cli incorrectly detects the iOS app path as
+ * jitsi-meet/ios/app and thus all pod references in the now dynamically generated
+ * Podfile are wrong.
+ */
+module.exports = {
+    project: {
+        ios: {
+            project: '.ios/jitsi-meet.xcworkspace'
+        }
+    }
+};