add 4icons and one example icon in liker-and-seenusers.html

src/server/views/layout-growi/widget/liker-and-seenusers.html

@@ -1,4 +1,10 @@
 <div class="liker-and-seenusers">
+  <img class="rounded-circle picture picture-sm" src="/images/icons/pagelist.svg">
+  <img class="rounded-circle picture picture-sm" src="/images/icons/recent-changes.svg">
+  <img class="rounded-circle picture picture-sm" src="/images/icons/attachment.svg">
+  <img class="rounded-circle picture picture-sm" src="/images/icons/timeline.svg">
+  <img class="rounded-circle picture picture-sm" src="/images/icons/user.svg">
+
   <!-- <div
     id="liker-list"
     data-user-ids-str="{{ page.liker|slice(-15)|default([])|reverse|join(',') }}"