Completely new fastlane onboarding

* Complete rewrite of the `fastlane init` onboarding flow (#11386) via Felix Krause
* Keep track of files modified when generating Swift API (#11482) via Joshua Liebowitz
* Update all remaining links that still linked to old GitHub docs (#11483) via Felix Krause
* Add tests to verify the built-in actions follow the conventions (#11332) via Felix Krause
* spaceship and deliver: add support for the new iPad (#11330) via Felix Krause
* Check for missing requires  (#11472) via Manu Wallner
* Pin ruby version on Circle (#11488) via Manu Wallner
* Add parentheses for all method calls (#11474) via Felix Krause

https://github.com/fastlane/fastlane/releases/tag/2.75.0
