3.0.721

Replace xxd with hex-ify.

This reduces the dependencies required to build darkstat.

3.0.720

3.0.720 (10 Jan 2022)

• Improve graphs on mobile (thanks to Dallen Wilson).
• Add favicon, improve CSS (thanks to Daniel Aleksandersen).
• Export host statistics in Prometheus format on /metrics (thanks to flowblok).
• Move to github.