Iterate on the ecosystem design document

[jmatsushita]

Iterate on the ecosystem design approach described at http://iilab.github.io/contentascode/approach/ and develop some non-technical introduction document to the benefits and features of such an approach. (An example of this is to enable workflows where open contribution to a website is easy and works with translation workflows).

• [x] Setup reference implementation of the workflow on this repo (i.e. eat your own dog food or release very early)
• [x] Migrate wiki to markdown files on this repo.
• [x] Add structure to the content and add inputs from partnership discussions.
• [x] Summarise possible roadmap and functional evolution stages synthetically and visually

[jmatsushita]

There is more work to do on the roadmap #33 but I'll close this issue until more work is done on the contentascode website.