Certain challenges involve code that is not run until the user
interacts with the preview (typically via a click listener). This uses
consoleProxy to report those errors.
Error logging has been simplified, reducing the number of places errors
can be reported from.
Some of the redux-saga code has been renamed in an attempt to improve
clarity.
* fix(client): add cache-busting hashes to chunks
* fix: create cache-busting names for the workers
Prior to this PR the first webpack compilation gave the workers static
names. This can cause caching problems, so this PR adds hashes to
their names to invalidate the cache.
In order for Gatsby to find them, the names are added to the
config directory.
