Network visualization

[vincerubinetti]

Closes #6 (except for "nice to haves", which we can revisit later)

• fix playwright install action
• add some nice options to flex component
• network viz
  • settle on cytoscape library
  • customizable colors/sizes/etc
  • legend and key
  • selectable nodes/edges
  • max nodes slider
  • expand button
  • download options
  • add all available built-in and plugin layout algorithms, except ones with only a few dozen stars on github and ones that crash. explicitly set some key options for each algo to make them look sensible.
• add network viz to top of testbed page, with fake generated data
• util func to pick key colors
• download util funcs

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[vincerubinetti]

I'll add shapes (tied to colors which are mapped to unique types, for color-blindness) in a future PR.

Also more filters can/will be added when this network component starts to be used in-situ. E.g., only show nodes with p-value between A and B. These filters will exist outside the component, since they are more specific and not generic to all use-cases of the component. That is, the sliders will be outside of the component, and the node/edge data will be filtered appropriately before being passed to the component.