Fixes #18638 - add sass support to webpack

Fixes #18426 - Add actions to notification entries

This adds support for the notifications to display actions. In case no
actions are provided, the dropdown kebab isn't shown. The actions
possible right now only include GET links.

refs #18464 - rename *.spec.js to *.test.js

Fixes #18530 - fix package.json dependencies

fixes #18466 - change getHostsData function name to be singular

fixes #18464 - Add Redux to statistics page

This is a first step to replacing Flux with Redux

Fixes #18194, #18326 - minor UI bugs Notifications

persist open group on navigation
remove expand toggle indicator

fixes #18191,#18192 - monitor notification request

prevent multiple requests, stop polling after error

fixes #18010 - UI Notifications front-end implementation

fixes #17600 - Storybook does not draw chart