feat(web-ui): disable zoom in mobile devices (#861)

Author: johanbook

services/web-ui/src/App.css

@@ -1,3 +1,8 @@
-html, body {
+html,
+body {
   height: 100%;
+
+  /* Disable zoom on mobile devices 
+   * See https://stackoverflow.com/questions/4472891/how-can-i-disable-zoom-on-a-mobile-web-page */
+  touch-action: pan-x pan-y;
 }