make skilltree/curriculum module

[serapath]

@todo

• crawl workshop.json to print skilltree as json (network structure)
• find or build a json graph visualisation library (e.g. "graph dracula" or "cytoscape")
  • maybe based on interactive SVGs?
• visualise play skilltree json so users can navigate to individual workshops
• use to make landing page (code camp module) for play.ethereum.org
• improve the edges between nodes
• display workshop icons in nodes
• add cool themes for the skilltree

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IMPORTANT

• think about how to make sure we find all workshops hosted anywhere (but keep it decentralised)
• It might be necessary to scroll or "drag" the skilltree around to see all parts.
• the skilltree should ideally have a "deterministic layout", so that if new workshops are being added, the skilltree map structure looks the same to somebody who returns to it after some time

A single entry in the skilltree might later include information about:

• dependencies
• contributors list (supply network, % of fee for each)
• badges (shows finished workshops)
• https://ninabreznik.github.io/CryptoLife/
• inspired by: http://www.dungeonsanddevelopers.com/#_akl_4_Your%20Name

The skilltree module should be usable to generate:

• a codecamp static page, which displays exactly a manually selected set of workshops (sub-skilltrees)
• a skilltree displays all workshops it can find by crawling workshop.json's and needs/unlocks and continues indefinitely as long as it finds more workshops

See also mockup / wireframe issue / ux