High level architecture document #191
Description
Add a high level architecture document to /docs.
Add some of the info in the actual Readme, plus the diagram in https://www.mozillascience.org/projects/contributorship-badges <-- the diagram needs to be updated.
An explanation of what part of the system is and where it is hosted and so forth. Which parts Mozilla hosts, which parts others host, how do they connect? How many API keys are needed to run the app? what’s in the cloud and what is not.