fixing a few links in the docs
creates default ~/.psiturkconfig file when first running psiturk-setup-example (if it doesn't already exist)

- previously to auto generate the global config file needed to run psiturk at least once by itself.
- now "getting started" instructions easier since all necessary config files in place after setting up the example.
draft of roadmap
update quickstart to point at main website
new sections

- anatomy of a project
- step by step instructions
- AMT setup