docs(*): add Troubleshooting Deis docs

closes #2294

/cc @johanneswuerbach 
We typically [capitalize component names](http://docs.deis.io/en/latest/understanding_deis/architecture/#store) in the docs. This is more of a reference to each component instead of "The Store" though, so it could go either way. It's also the architecture documentation so it's a little more formal. Your call @carmstrong