OZG-6129 OZG-6197 Add demo app and keyboard control

alfa-client/apps/demo/src/app/app.component.html

alfa-client/apps/demo/src/app/app.component.ts

alfa-client/libs/design-system/src/index.ts

...instant-search/instant-search/instant-search.component.ts

...b/instant-search/instant-search/instant-search.stories.ts

...lib/instant-search/search-field/search-field.component.ts

...search/search-result-item/search-result-item.component.ts

...arch/search-result-layer/search-result-layer.component.ts