feat(storybook): update formatting; introduce new pages; update keycloakify

src/keycloak-theme/pages/LoginUsername.stories.tsx

@@ -0,0 +1,17 @@
+import { ComponentMeta } from '@storybook/react';
+import KcApp from '../KcApp';
+import { template } from '../../../.storybook/util'
+
+const bind = template('login-username.ftl');
+
+export default {
+    kind: 'Page',
+    title: 'Theme/Pages/Login/Username',
+    component: KcApp,
+    parameters: {
+        layout: 'fullscreen',
+    },
+} as ComponentMeta<typeof KcApp>;
+
+export const Default = bind({})
+export const WithEmailAsUsername = bind({ realm: { loginWithEmailAllowed: true, registrationEmailAsUsername: true } })