replace event banner by its blurhash image, add headline picture to EventMetadataSidebar, The headline picture in the sidebar is clickable, like the map, but it suffers the same issue as #866 (closed)
what has been done: watch hash in BlurhashImg.vue, created BlurhashImgWrapper.vue, modivied EventBanner.vue and EventMetadatSidebar.vue
This solves, at least for me, #223 and #717 using another approach (blurhash instead of cropping). This is how the event platform resident advisor is doing it.