A .prettierignore is added so that content/static/js/*.min.js files are
ignored when running prettier.
Change-Id: I13738e03a1681475dd3d767258aefcaec73c99d5
Reviewed-on: https://team-review.git.corp.google.com/c/golang/discovery/+/756683
CI-Result: Cloud Build <devtools-proctor-result-processor@system.gserviceaccount.com>
Reviewed-by: Jonathan Amsterdam <jba@google.com>
Julie Qiu