chore: Clean up unused files, imports, and work on getting end-to-end tests and unit tests running (#2272)

platform/ui/src/components/ViewportActionBar/ViewportActionBar.jsx

@@ -170,7 +170,12 @@ const ViewportActionBar = ({
           }}
           onClick={() => {
             if (state === 3) {
-              onPillClick?.();
+              // TODO: Gatsby build failing due
+              //       to ESLint's "no-unused-expressions"
+              //onPillClick?.();
+              if (onPillClick) {
+                onPillClick();
+              }
             }
           }}
         >

platform/ui/src/components/ViewportActionBar/ViewportActionBar.mdx

@@ -19,6 +19,7 @@ import { ViewportActionBar } from '@ohif/ui';
 
 ## Basic usage
 
+<>
 <Playground>
   <div className="p-4 h-64">
     <ViewportActionBar
@@ -127,6 +128,7 @@ import { ViewportActionBar } from '@ohif/ui';
     />
   </div>
 </Playground>
+</>
 
 ## Properties