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.
An example of the examples is a bit too meta for me, I don't think it helps. In fact, consider removing this whole "How to Use the Examples" section and replacing it with a note that you need to set up the requirements as needed by the tutorial.