Add more distance for topics in agenda slide

Makes the projection of the agenda looks cleaner and more relaxed

client/src/app/slides/agenda/item-list/item-list-slide.component.html

@@ -1,4 +1,4 @@
-<div *ngIf="data">
+<div *ngIf="data" class="agenda-slide-wrapper">
     <h1>{{ 'Agenda' | translate }}</h1>
 
     <div

client/src/app/slides/agenda/item-list/item-list-slide.component.scss

@@ -1,6 +1,12 @@
+.agenda-slide-wrapper {
     .item {
         line-height: 34px;
     }
+
+    .item + .item {
+        margin-top: 10px;
+    }
+
     .mainitem {
         font-size: 110%;
     }
@@ -8,3 +14,4 @@
     .subitem {
         font-size: 90%;
     }
+}