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.
Instead of a title, this can be prose, something like "You can verify that the data has moved with the application by finding it on the other node".

I'm not keeping track mentally of all the IP addresses used in the tutorial, and they should be more explicitly pointed out. This should all be consistent with other examples.