Review SCSS refactoring for to-be-deprecated Bourbon functions (#1959)

* [Frontend] Refactor SCSS to remove deprecated @includes

Fixes #1891
- In progress

* [Frontend] Refactor SCSS to remove deprecated @includes

Fixes #1891
Making bourbon happy by refactoring to-be-deprecated
calls to prefixing @includes:
- transform and related CSS;
- flex and related CSS;
- Fixed double semi-colons to single;

platform/commonUI/general/res/sass/search/_search.scss

@@ -152,7 +152,7 @@
             opacity: 1;
         }
 		.load-more-button {
-            @include transform(translateX(-50%));
+            transform: translateX(-50%);
             display: inline-block;
 			margin-top: $interiorMargin;
             padding: 0 $interiorMarginLg;