• Improve the server's error messages on the console and in logs.
• Switch the UI build from the yarn package manager to npm.
  This makes Moonfire NVR a bit easier to build from scratch.
• Extend the moonfire-nvr check command to clean up several problems that
  can be caused by filesystem corruption.
• Set the page size to 16 KiB on moonfire-nvr init and
  moonfire-nvr upgrade. This improves performance.
• Fix mangled favicons
  (#105)