Ability to delete default workflows and add multiple repositories to a single roadmap project

[vizthex123]

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The former would let me add workflows for other repositories (that way I can have a "here's all the issues across all of my repos" board), and the latter would let me easily plan multiple things at once (as some repos are related to another one, so I want them both to be in the same roadmap).

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• I have read the above statement and can confirm my post is relevant to the GitHub feature areas Issues and/or Projects.

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