v0.9.1

Full Changelog

• Update README to say how to build the desktop app
  #2732
• Add signing ID in release_config.yaml
  #2731
• Makeover!
  #2722
• Fix broken tests
  #2730
• Make the 'loading' tests work in isolation
  #2727
• Use a PNG for the icon on non-Windows
  #2708
• Add missing brackets to call to toUpperCase
  #2703