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/radioSelect.test.js

@@ -17,6 +17,9 @@ describe('RadioSelect', () => {
   ];
   const HOURS = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24];
   let originalOptionsForAllCategories;
+  let originalOptionsForCategory;
+  let selectedOption;
+  let categoryButtons;
 
   const getDataFromOption = (option) => {
     return {