Add Basic Story For SearchInput

I had to remove `| dateTime('dd.MM.yyyy')` in line 61 of the vue file due to issues with $i18n which surely can be easyly solved.
The idea is, that `results` is an object which contains the keys `posts` and `users`. The values are arrays with the search results.

webapp/components/SearchInput/SearchInput.vue

@@ -58,7 +58,8 @@
                   <ds-flex-item>
                     <ds-text size="small" color="softer" align="right">
                       {{ option.author.name | truncate(32) }} -
-                      {{ option.createdAt | dateTime('dd.MM.yyyy') }}
+                      {{ option.createdAt }}
+                      <!-- removed  | dateTime('dd.MM.yyyy') -->
                     </ds-text>
                   </ds-flex-item>
                 </ds-flex>