wizard: don't show the form as a modal

When the user clicks on the "create an image" button, the image wizard
shows up replacing the landing page. This allows to keep the quickstart
guides to the right of the wizard while the user is interacting with it.

src/test/Components/CreateImageWizard/CreateImageWizard.test.js

@@ -118,7 +118,7 @@ describe('Create Image Wizard', () => {
   test('renders component', () => {
     renderCustomRoutesWithReduxRouter('imagewizard', {}, routes);
     // check heading
-    screen.getByRole('heading', { name: /Create image/ });
+    screen.getByRole('heading', { name: /Image Builder/ });
 
     screen.getByRole('button', { name: 'Image output' });
     screen.getByRole('button', { name: 'Register' });