High level architecture document

[josmas]

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.

[josmas]

@acabunoc the URL above is redirecting to the new site so I cannot find the diagram anymore. You mention it was a good doc or similar?

[josmas]

This still needs quite a bit of work, but we have a starting draft.