v1.22.1

Feature

• Add optional query parameter for HTML message iframe embedding (#434)
• Add optional UI setting to skip "Delete all" & "Mark all read" confirmation dialogs(#428)

Chore

• Update node dependencies
• Update Go dependencies
• Add API CORS policy to HTML preview routes (#434)
• Bump actions/stale from 9.0.0 to 9.1.0 (#432)