[TIMOB-27790] Docs as Code

We've automated our "legacy" process for publishing docs, which consist of two major doc types: - API Docs - Guides Guides currently come from our Wiki and are published to docs.appcelerator.com (after being exported as HTML and massaged), and we also trigger a wiki crawl from Zoomin to publish the contents to Zoomin/docs.axway.com APIDocs live as xml files in our titanium_mobile repo, and we use custom node scripts to generate jsduck JS files, then run that through a fork of jsduck to generate the docs.appcelerator.com website. Moving forward we'd like to move away from the wiki as source of our Guides content towards markdown files living in a Github repo (probably directly in titanium_mobile?). How can we extract the current wiki contents into markdown? Clean it up? Remove outdated docs? And then how does that get published out to Zoomin? We'd also like to take our API docs and combine efforts with the Dublin team that already published their API docs out. We need to find a way to incorporate multiple products in the same doc website, while hopefully leveraging [~jvennemann]'s work on his prototype: https://appcelerator.github.io/titanium-docs/api/