Produce assets required to launch open beta

Original list: #144 (closed)

Revised list for open beta:

• Application icons
  • Adaptive icon
  • Themed icon
• Logo and wordmark
• Play Store graphics
  • Screenshots
  • Banner [optional]
• Announcement graphics
  • Blog
  • Newsletter
  • Social media
• Release graphic (i.e. for continued releases)
• Updated assets for download page
• Figma template for support portal screenshots