fix the path to strudel SPA install

sv2.conf

 location ~ /sv2.* {
-        root /var/www/sv2/dist/;
+        root /opt/strudel2/spa/sv2;
         #alias /var/www/sv2/dist/sv2/;
         try_files $uri$args $uri$args/ $uri/ /sv2/index.html;
 }