FIX: Add margin for tour toc header to css

src/core/css/tour.css

@@ -251,6 +251,10 @@ div.caosdb-v-tour-toc-show {
     border: none;
 }
 
+.caosdb-v-tour-toc-header {
+    margin-left: 0.75rem;
+}
+
 /* For elements in popovers which are not for clicking but only illustrative. */
 .caosdb-v-tour-unclickable {
     cursor: text !important;