Async chapter tracking issue 🎉

[chriskrycho]

• First draft [WIP] async and .await chapter #3909
• Internal editing and revision
  • First revision [wip] Edits for async chapter #3965
  • Tech reviews
    • Will Crichton (@willcrichton)
    • James Munns (@jamesmunns)
    • Tim McNamara (@timClicks)
  • Fix CI Async chapter edits #3983
  • Second revision More edits to the async chapter #4033
    • Integrate listing changes Incorporate chapter numbering changes for new Ch. 17 #4042
    • Add redirects Add HTML-based redirects for previous chapter numbering #4061
• Publish trpl crate. (Otherwise folks will not be able to actually do what we tell them to in the examples!)
• Coordinate with playground to include trpl in its container, so that the mdbook output is runnable in the playground. (@carols10cents I think you know a guy who can help point me in the right direction on this. 😉)
• Merge updated build infra in Rust Update TRPL to add new Chapter 17: Async and Await rust#131859

[chriskrycho]

Going to go ahead and mark this as Done. There will also be further updates to the materials once we get revisions back from NoStarch, but the online version that is shipping with 1.85 is, uhh, shipping with 1.85!