[META] Delete unused branches

[skrunked]

Description:

Delete any branches which are linked to closed PRs, and assess any branches which have remained dormant since before BattleCry for whether they need to remain open.

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Category:

• Documentation
• Refactoring / Cleanup
• Testing
• Tuning / Calibration
• Setup / Configuration
• Other:

Urgency

• Nice to Have
• Important
• Critical

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Resources:

https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/proposing-changes-to-your-work-with-pull-requests/creating-and-deleting-branches-within-your-repository