chore: try a nested list for steps

[thomasheartman]

I wanted to make it clearer that the bundle exec rake release should be run from the main branch because I wasn't sure when I released 5.1.1. I also nested some of the other steps so that the list is separated.

Happy for you to approve or reject this.

[coveralls]

Pull Request Test Coverage Report for Build 11103398213

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
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• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 95.374%

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Totals
Change from base Build 11100981288:	0.0%
Covered Lines:	433
Relevant Lines:	454

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💛 - Coveralls

[sighphyre]

LGTM