Merge pull request jupyter#556 from dn-flixee/developLazyLoading

Developed lazy loading in cards.html

Author: palewire

_includes/cards.html

@@ -7,7 +7,9 @@ <h4 class="col-sm-12">{{include.cohort_name}}</h4>
         <img
           class="council-member-photo"
           alt="{{member.name}}"
-          src='{{site.baseurl}}/assets/distinguished/{{member.photo}}' />
+          src='{{site.baseurl}}/assets/distinguished/{{member.photo}}' 
+          loading="lazy"
+          />
         <div class="card-header text-nowrap">{{member.name}}</div>
         <div>&nbsp;</div>
         <div class='badges'>