simplify 'linecharts/simple_timeseries' example

  axis-top: off;

  axis-right: off;

  margin: 0px;

  margin-top: 1.1rem;

  margin-bottom: 2.6rem;

  margin-left: 5rem;

  margin-right: 3.4rem;

  xdomain-format: datetime("%H:%M:%S");

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