Streamline tutorial docs

Fixes #634 
Replaces repetitive tutorials with an "Examples" section in "Getting Started", with much simplified structure and tutorials replaced with more minimal example Flocker config files and instructions.
Perhaps having a note on each one saying that they should have the requirements and setup as in the tutorial, with a link is enough.

Aim to have this tutorial readable and follow-able by someone coming straight to this page, even if it does make the document longer. They will still be noticeably shorter than they were before.