Feat/webpack (#2998)

* First commit

* Removed govuk for webpack. Modernized javascript importing. Removed dead js

* Fixed tests, a few styling bugs

* Fixed some table errors and regenerated backstop ref images

* Updated tests for coverage

* Changes from carlo suggestions

tests/javascripts/copyToClipboard.test.js

@@ -16,6 +16,7 @@ describe('copy to clipboard', () => {
   let component;
   let selectionMock;
   let rangeMock;
+  let screenMock;
 
   const setUpDOM = function (options) {