Renamed calendar icon and changed references in html

Author: cameronoelsen

assets/calendar-icon.svg assets/calendar.svgassets/calendar-icon.svg renamed to assets/calendar.svg

@@ -107,7 +107,7 @@ <h3 class="resource-name">Jupyter on Stack Overflow</h3>
                 <div class="col-sm-12 col-md-12 resource-section">
                     <div class="resource-content">
                         <div class="col-md-2">
-                            <img src="assets/calendar-icon.svg" class="resource-logo" alt="calendar icon">
+                            <img src="assets/calendar.svg" class="resource-logo" alt="calendar icon">
                         </div>
                         <div class="col-md-8 resource-text">
                             <h3 class="resource-name">Jupyter Events</h3>