Add Versioning to Docs

[alexlwn123]

Since we're going through our first major breaking change, it'd be nice to keep a record of our old docs for prosperity.

See the Vitepress versioning plugin: https://vvp.imb11.dev/

[datmedevil17]

Please assign me this issue.

[alexlwn123]

@datmedevil17 Hey! fwiw, you can just start working on it without me assigning it