This commit modifies interactive and non-interactive behaviors around `gh repo edit` as well as providing greater information about the impact.
1. `--help` usage is expanded to highlight the most significant consequences of changing visibility
1. `--help` usage and interactive experience call out GitHub Docs content that act as source of truth about full consequences of various changes
1. `gh repo edit` interactive experience will require confirmation for any visibility change
1. `gh repo edit` interactive experience will output potential stars and watchers lose regardless of visibility transition
1. `gh repo edit` will require `--visibility` flag to include new `--accept-visibility-change-consequences` flag regardless of interactivity
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