Remove Flipper (mongodb-university#210)

* In this version of React Native, current versions of Xcode are not
compatible with Flipper dependencies
* This commit disable Flipper from being installed in the Pod Install
phase
* In effect, this will avoid failures when using the template

sync-todo/v2/client/react-native/ios/Podfile

@@ -8,17 +8,6 @@ require Pod::Executable.execute_command('node', ['-p',
 platform :ios, min_ios_version_supported
 prepare_react_native_project!
 
-# If you are using a `react-native-flipper` your iOS build will fail when `NO_FLIPPER=1` is set.
-# because `react-native-flipper` depends on (FlipperKit,...) that will be excluded
-#
-# To fix this you can also exclude `react-native-flipper` using a `react-native.config.js`
-# ```js
-# module.exports = {
-#   dependencies: {
-#     ...(process.env.NO_FLIPPER ? { 'react-native-flipper': { platforms: { ios: null } } } : {}),
-# ```
-flipper_config = ENV['NO_FLIPPER'] == "1" ? FlipperConfiguration.disabled : FlipperConfiguration.enabled
-
 linkage = ENV['USE_FRAMEWORKS']
 if linkage != nil
   Pod::UI.puts "Configuring Pod with #{linkage}ally linked Frameworks".green
@@ -40,7 +29,7 @@ target 'SyncTutorial' do
     #
     # Note that if you have use_frameworks! enabled, Flipper will not work and
     # you should disable the next line.
-    :flipper_configuration => flipper_config,
+    :flipper_configuration => FlipperConfiguration.disabled,
     # An absolute path to your application root.
     :app_path => "#{Pod::Config.instance.installation_root}/.."
   )