Change print button to an <a> to match the rest of the buttons

Also makes it have pointer cursor

layouts/partials/share.html

@@ -54,9 +54,10 @@
     */}}
 
     {{ if .Site.Params.shareButtons.print }}
-        <button class="print-share"
+        <a class="print-share"
+           href="javascript:void(0)"
            onclick="window.print(); share_event('Print');">
             {{- partial "icon.html" "printer" -}}
-        </button>
+        </a>
     {{ end }}
 </div>