ref(docs): move "Gen SSH Key" section inline to each install doc
ref(docs): move "make disco-url" section inline to each install doc
ref(docs): move "get the source" header to the including document
docs(hacking_on_dies): deisctl link fixed

deisctl link updated to master branch in deis/deis
Merge pull request #2534 from paweloczadly/2533

docs(hacking_on_dies): deisctl link fixed
Merge pull request #2532 from mboersma/docs-install-inlines

Move "generate SSH key" and "make discovery-url" sections inline to docs
docs(schedule): add release schedule & planning documentation