An attempt at better documentation for q-d

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This PR contains 2 things (which should probably be separated), and is in draft because it's lacking a 3rd thing:

1. A q-d implementation of the Circular Buffer example which is comes from the Pulse article and is also implemented in q-s-m. This example could be a good basis to explain and test parallel actions from #72
2. An attempt at explaining what is Dynamic Logic and why it's important and useful
3. A way to generate and publish these as documentation on this project's pages: https://input-output-hk.github.io/quickcheck-dynamic

Checklist:

• [ ] Check source-code formatting is consistent