WIP: Add a list view

[wking]

Initial work on #62.

I've stuck with full-SVG for this view, because I wanted it to be easy to implement the edges. But means it will be more work to get the card layout right.

• [ ] wide card layout
• [ ] responsive card layout
• [ ] selectable node with transparency for unselected nodes and unrelated edges
• [ ] arrow keybindings for navigation
  • [ ] navigating to the next/previous card
  • [ ] navigating via graph links (right arrow from the card to get to the links, and up-down to change the selected link, and enter (or right arrow again?) to select the node on the other side of the selected link.

[wking]

Long way to go still, but the node positioning and initial edge layout look good to me:

[wking]

Bigger list graph (real data :) with a tweaked dependencyWeight (+0.1 for every open ancestor, instead of +0. Still +1 for every closed ancestor):

[wking]

Closer. Still need to shuffle some space around in these wider cards and land some clip-paths.

[jbenet]

yay. we have to reduce the visual complexity (in this or a future PR). possibilities:

• fade out the colors of bright lines and only go bright on hover
• re-work background/border of items. its too big.