Introduce the group activity section

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

js/src/views/Event/Event.vue

@@ -737,11 +737,9 @@ import { IParticipant } from "../../types/participant.model";
   },
   metaInfo() {
     return {
-      // if no subcomponents specify a metaInfo.title, this title will be used
       // eslint-disable-next-line @typescript-eslint/ban-ts-comment
       // @ts-ignore
       title: this.eventTitle,
-      // all titles will be injected into this template
       titleTemplate: "%s | Mobilizon",
       meta: [
         // eslint-disable-next-line @typescript-eslint/ban-ts-comment