tallyard v0.5.0

Mostly a dependency update release with a few bugfixes.  Golang version 1.18 or
later is now also required.

David Florness (10):
      Upgrade gnark from v0.5.2 to v0.6.4
      Upgrade gnark from v0.6.4 to v0.7.1
      Configure gnark logger to use logs file
      Upgrade mautrix-go from v0.10.11 to v0.12.1
      Don't redact create events
      site: better styling for mobile
      LICENSE: switch to MPL-2.0
      go.mod: bump dependencies
      go.mod: require golang 1.18
      Bump version to v0.5.0