Allow reverting setups to a previous revision

[blert-io]

Reporters: A Hard Carry (from Discord)

Summary:
A user asked if it was possible to revert a setup to an earlier revision (e.g., revert to revision 21 of https://blert.io/setups/pKdemV-T_L0?revision=21). Currently, this functionality does not exist, but it would be useful to allow users to roll back setups to a previous state. The request originated from Discord.

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Original Discord message

[frolv]

Enabled in #259 though I'd also like to have a proper in-editor workflow for this.