added disableImageZoom parameter to disable image zoom

layouts/partials/footer.html

@@ -41,11 +41,13 @@
 
   </div>
   <script>
+    {{ if not .Site.Params.disableImageZoom | default true }}
     mediumZoom(document.querySelectorAll("img:not(.nozoom)"), {
       margin: 24,
       background: 'rgba(0,0,0,0.5)',
       scrollOffset: 0,
     })
+    {{ end }}
   </script>
   {{ $jsProcess := resources.Get "js/process.js" }}
   {{ $jsProcess = $jsProcess | resources.Minify | resources.Fingerprint "sha512" }}