Website build broken due to 404s on developer.apple.com

[DanTup]

Seems like Apple have moved (or removed) a bunch of content without redirects. I'm not sure how we can easily figure out what the new equivs of these pages are!

 *  External link https://developer.apple.com/library/content/documentation/IDEs/Conceptual/AppDistributionGuide/ConfiguringYourApp/ConfiguringYourApp.html failed: 404 No error
  *  External link https://developer.apple.com/library/content/documentation/IDEs/Conceptual/AppDistributionGuide/DistributingYourAppUsingTestFlight/DistributingYourAppUsingTestFlight.html failed: 404 No error
  *  External link https://developer.apple.com/library/content/documentation/IDEs/Conceptual/AppDistributionGuide/Introduction/Introduction.html failed: 404 No error
  *  External link https://developer.apple.com/library/content/documentation/IDEs/Conceptual/AppDistributionGuide/MaintainingCertificates/MaintainingCertificates.html failed: 404 No error
  *  External link https://developer.apple.com/library/content/documentation/IDEs/Conceptual/AppDistributionGuide/SubmittingYourApp/SubmittingYourApp.html failed: 404 No error
  *  External link https://developer.apple.com/library/content/documentation/IDEs/Conceptual/AppDistributionGuide/Troubleshooting/Troubleshooting.html failed: 404 No error
  *  External link https://developer.apple.com/library/content/documentation/IDEs/Conceptual/AppDistributionGuide/UploadingYourApptoiTunesConnect/UploadingYourApptoiTunesConnect.html failed: 404 No error
  *  External link https://developer.apple.com/library/content/documentation/LanguagesUtilities/Conceptual/iTunesConnect_Guide/Chapters/About.html failed: 404 No error
  *  External link https://developer.apple.com/library/content/documentation/LanguagesUtilities/Conceptual/iTunesConnect_Guide/Chapters/CreatingiTunesConnectRecord.html failed: 404 No error

[mit-mit]

cc @xster

[mit-mit]

When resolving this, please make sure to revert flutter/website#928

[xster]

flutter/website#931

[github-actions]

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