Consider verification modes

[cyrusae]

Probably just for programmatic repo creation in #14 but saving the phrasing:

entangle: Ready to wire up "my-project"

ConfigFile: .git/config
──────────────────────────────────────────────────────────────────────
[+] Add Push URL:  git@github.com:cyrusae/my-project.git  -> (origin)
[+] Add Push URL:  git@tangled.sh:atdot.fyi/my-project -> (origin)
[*] Set Fetch URL: git@github.com:cyrusae/my-project.git  -> (origin)
──────────────────────────────────────────────────────────────────────

Proceed with these changes? [Y/n]: