Mako Desktop 0.3.0

What's Changed

• Desktop: sign in via system browser with mako:// deep-link handoff (no more in-app Google login) by @joanrodriguez in #480
• desktop: bump to 0.3.0 to cut the deep-link sign-in release by @joanrodriguez in #481

Full Changelog: desktop-v0.2.0...desktop-v0.3.0