feat(ui): Added link-button to ui-libs. (TV-855)

Squashed commit of the following:

commit 1aab96d7f243c77adbd806196f76b931f4445976
Author: Erik Tiekstra <erik.tiekstra@arbetsformedlingen.se>
Date:   Thu Oct 28 11:38:05 2021 +0200

    Added digi-link component to ui lib

libs/ui/link-button/link-button.component.stories.ts

@@ -0,0 +1,15 @@
+import { LinkButtonComponent } from './link-button.component';
+import { UiLinkButtonModule } from './link-button.module';
+
+export default { title: 'LinkButton', component: LinkButtonComponent };
+
+const componentModule = {
+  moduleMetadata: {
+    imports: [UiLinkButtonModule],
+  },
+};
+
+export const standard = () => ({
+  ...componentModule,
+  template: '<ui-link-button></ui-link-button>',
+});