[agus-darmawan]

Documents the time synchronisation from #5:

• New docs/time.md:
  • which clock is kept by what on the Lite3 (Molly's computer, the Mid-360, the motion host, the front camera, the dashboard);
  • the settings in molly.env, scripts/setup.sh install timesync ptp and the output of check;
  • the boot wait and the health check;
  • a symptoms table.
• The docs index and the README point to it.

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