Covid worked example

[jc-harrison]

Adds a worked example to demonstrate producing mobility indicators.

Binder link: https://mybinder.org/v2/gh/Flowminder/FlowKit-tutorials-Ghana/worked-example?urlpath=lab/tree/mobility-indicators.ipynb

[review-notebook-app]

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[traceyli]

I like the content and structure here, but there is a lot of content to digest in one go. I would find the following useful:

• A 'table of contents' at the start, with each of the sections listed, so that people know what to expect. And may choose to prioritise some sections over others.
• A clear mapping of which aggregates are used in each QA check, and each mobility indicator. Maybe include this somehow in the table of contents?
• Explain all acronyms and jargon (e.g. 'QA check', 'pcod') prior to the first usage of the term.