Allow precommit-bypassing fixup! commit

**Is your feature request related to a problem? Please describe.**
It's not a problem, but it's very frustrating when I want to add a fixup! commit and I have to run my entire precommit hook, or disable it manually and re-enable it afterward.

**Describe the solution you'd like**
I'd like to see a fixup! commit command that bypasses pre-commit hooks.

**Describe alternatives you've considered**
- Blank out the pre-commit package.json script
- Comment out any Husky pre-commit commands