Add REV support to stage 1B

[Daniel1464]

Description

Adds REV support to the stage 1B docs, including a chooser between the different vendors for code snippets within the exercises.

Also adds references to the solution GitHub repos in the docs.

Meta

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[github-actions]

🌐 Preview URL: https://pr-147.frcsoftware.pages.dev

[roboteer5291]

Please add this to the website feature guide as well

[roboteer5291]

Should the sync key be changed to something more general? I'd imagine we want the ctre/rev tabs to synchronize across the entire site, not just stage 1b (as the sync key you have now is for 1b)

[roboteer5291]

Oh, and exactly how to set this up, with code ready to copy paste, should be included on one of the contribution pages or in the readme or something. Not sure where off the top of my head