Release v1.2.0

What's Changed

• new UI for viewing currently running jobs, see here
  • active by default, can be disabled
  • the status page includes a link if the job view is enabled
  • included in the metrics
• more docs
• default value for Cache TTL has changed: There are defaults now, 1h for project's list cache, 5min for runner's list. See 7dcc90a
• API is served with and without /builds prefix
• Improvements to the docker-compose example (see #50)
• Logging on info level is drastically reduced
• The timestamp of the last update is converted to the timezone of the user's browser (only works with JavaScript enabled)
• A lot of changes under the hood
  • dependency updates, GHC version updates
  • Simpler, more robust, and more elegant thread handling