We consolidate the code that fetches the data for `ProjectCard` in one
module, adjacent to the `ProjectCard` component. We also consolidate all
the data into one interface to simplify the component API.
With the data loading in one place we can eliminate duplicate code and a
handful of helper functions.
The consolidation also allows us to discover some optimizations to
fetching: We parallelize requests and we use the commit detail endpoint
instead of the commit list endpoint. For the latter to pay off, we need
to deploy caching to the API.
