fix menu header for users

Author: Daniel Lobo

components/Header.js

@@ -58,9 +58,9 @@ class Header extends Component {
 
             {/* <RenderButton href="/teacher_dashboard" content="Teacher" /> */}
             <RenderButton href="/playground" content="Playground" />
-            <RenderButton href="/student-login" content="Student" />
-            <RenderButton href="/lti-exam-registration" content="LTI" />
-            <RenderButton href="/takeexam" content="Take Exam" />
+            {/* <RenderButton href="/student-login" content="Student" /> */}
+            {/* <RenderButton href="/lti-exam-registration" content="LTI" /> */}
+            {/* <RenderButton href="/takeexam" content="Take Exam" /> */}
             {/* <RenderButton href='/create_exam' content='Create Exam'/> */}
             {/* <RenderButton href='/create_exercises' content='Create Exercises'/> */}
           </Toolbar>