feat(SVG): make icons non draggable and selectable

assets/scss/style.scss

@@ -965,6 +965,14 @@ a.footnote-ref {
   animation: toxicGlow 5s ease-in-out infinite;
 }
 
+.toxicGlow img {
+  user-select: none;
+  -moz-user-select: none;
+  -webkit-user-drag: none;
+  -webkit-user-select: none;
+  -ms-user-select: none;
+}
+
 @keyframes toxicGlow {
   0% {
     background-position: 80% 50%;