Upgrade lolhttp.

#46 Fix box scrolling on Firefox and Chrome 72+

• Upgrade dependencies (lolhttp, scalacache, cats-effects)
• Favicon shows the board status

• Improve the error message when the board is not loaded or there's an error

• When a box is hovered, highlight the links that are connecting to it.

• upgrade dependencies, to fix some issues
  • lolhttp to 0.9.1
  • scalac to 2.12.4
  • marked to 0.3.9

• New calendar with SLO history and chart
• Support Markdown messages in checks

• Fix history fetching (#34)

• Allow creating custom routes with the app's state
• UI box improvement

• Layout improvement with screen auto-fitting
• API to return hourly statistics
• Update calendar statistics calculation