changed navigation

src/components/MUI/NavbarComponent.js

     setPreview(!preview);
   };
 
+  const filterNavItems = () => {
+    return navItems.filter(n => ((n === "users" && user.role === "SuperAdmin") || n !== "users"))
+  }
+
   useEffect(() => {
     let handler = (e) => {
       if (userRef.current) {
               }}
               className="navLinks-cont"
             >
-              {navItems.map((n) => (
+              {filterNavItems().map((n) => (
                 <Typography
                   variant="body1"
                   key={n}