Sign in without a password

✨ New Features

• Sign in with a one-click link sent straight to your inbox. Nothing to remember, nothing to reset.
• Sign up the same way, so you can be drafting before you've picked a password.
• Passwords are optional now. Set or change one whenever you like from Account settings.

🐞 Fixes

• Logging in from a marketing page now takes you into the app, not back to the page you came from.
• Removed the email typo suggestion on sign-up, which flagged perfectly good addresses.