fix: rewrite the sql args and variables codebase to use expression values

docs/website/docs/home.md

@@ -157,7 +157,9 @@ func main() {
     }
   }`
 
-  res, err := sg.GraphQL(context.Background(), query, nil)
+  ctx = context.WithValue(ctx, core.UserIDKey, 1)
+
+  res, err := sg.GraphQL(ctx, query, nil)
   if err != nil {
     log.Fatal(err)
   }

docs/website/docs/intro.md

@@ -25,6 +25,8 @@ Super Graph has a rich feature set like integrating with your existing Ruby on R
 - Fuzz tested for security
 - Database migrations tool
 - Database seeding tool
+- Works with Postgres and Yugabyte DB
+- OpenCensus Support: Zipkin, Prometheus, X-Ray, Stackdriver
 
 ## Try the demo app