gaufre: fix mobile style on websites w/ content going out of viewport

in DS, they have a footer that makes the website have a width larger
than viewport (creating horizontal scroll); this case was not handled
well by the gaufre on mobile. This rather rare case is now handled and
the gaufre doesn't care of the size of other content now.

website/public/api/v1/gaufre.js

@@ -166,7 +166,7 @@
         width: 100svw;
         height: 100%;
         height: 100svh;
-        margin: auto;
+        margin: 0;
       `
     }
     return `