* Highlight affected slices for filter change in dashboard view
Done:
- When user adds/deletes a filter in dashboard, affected slices will
have their header highlighted for 2 seconds
* Modified highlight to a more subtle box shadow
* Added slice-cell class for highlight transition
* Changed class name to slice-cell-highlight
`.jsx` linting is now in-scope for the `npm run lint` command, and
I linted the base files and some of the viz, there's still quite a bit
of work there, but that's a first pass on it.
