[beta] Add support for the new beta channel

dart-lang / api.dart.dev

Dart API docs

https://api.dart.dev

BSD 3-Clause "New" or "Revised" License

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Closed athomas closed 4 years ago

athomas commented 4 years ago

Add beta channel support (everywhere except for legacy URLs).
Remove trailing whitespace.
Simplify redirect logic to ensure that latest is set in all branches that use it.