fix(ContentManagerMenuItem.tsx): update text from "Manage Content" to…

… "Add Content" for clarity

The text displayed in the ContentManagerMenuItem component has been
updated from "Manage Content" to "Add Content" to provide clearer
functionality for users interacting with the menu item.

packages/auth/src/ContentManagerMenuItem.tsx

@@ -24,7 +24,7 @@ const ContentManagerMenuItem = ({
       <ListItemIcon className={listIcon}>
         <PostAddIcon />
       </ListItemIcon>
-      <ListItemText> Manage Content </ListItemText>
+      <ListItemText> Add Content </ListItemText>
     </MenuItem>
   )
 }