feat: allow deleting branches with 'd' (with a confirmation prompt)

[rahulk94]

fix #530

Description

This PR adds delete functionality by typing in d when on the heads remote. The user is prompted to enter y to confirm deletion and exits successfully after deleting the branch (similar to selecting a branch to avoid stale info being shown to the user).

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

Checklist:

• I have read the CONTRIBUTING document.
• My commits follow the commitizen commit convention
• My change requires a change to the documentation.
• I have updated the documentation accordingly.

[rahulk94]

Any chance you could take a look here @jwu910 some time soon?

[jwu910]

Hi thanks for opening up this PR.

I've been incredibly busy and may not have time to review soon. Im also still on the fence whether or not the functionality is going to be necessary, and may want to consider brainstorming how this could potentially be an extension similar to the extra Git log commands we have in place.

If a user can add to the config store an array of commands, we can hide this behind a flag and or user defined option to allow for deleting

Let me try to think about this a bit too, but definitely appreciate this PR opening up

[rahulk94]

Hey @jwu910 thanks for getting back to me. Yep no worries then. Have a think and let me know what you end up deciding.

[rahulk94]

Bah there's a bug here as heads might not be index 0 always. So IF we decide to go ahead with this approach, I'll fix this up