Enable linter for Javascript in CI/CD

[vprusso]

As part of the CI/CD pipeline, it would be ideal to enable a linter to check to ensure we are abiding by style guidelines for Javascript.

One such choice for a linter is "standard".

This enforces some rules that you may or may not agree with (like not using semicolons), however, I think we can turn those on/off at will depending on what we prefer.