[tor-bugs] #21428 [Metrics/Atlas]: Move the styling of the graphs into a stylesheet

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#21428: Move the styling of the graphs into a stylesheet
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     Reporter:  cypherpunks    |      Owner:  irl
         Type:  defect         |     Status:  new
     Priority:  Medium         |  Milestone:
    Component:  Metrics/Atlas  |    Version:
     Severity:  Normal         |   Keywords:
Actual Points:                 |  Parent ID:
       Points:                 |   Reviewer:
      Sponsor:                 |
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 While working on #21352 I've noticed the styling of the graphs is injected
 with JavaScript. The `plot` function uses the `style` function on almost
 every graph element. IMO it would be better to separate the styling into a
 stylesheet and assigns classes to the SVG elements.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21428>
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