**Apache Airflow version**: 2.1.1

**What happened**:

For user with "Op" role following menu items are not visible in navigation panel, however pages are accessible (roles has access to it):
- "Browse" -> "DAG Dependencies"
- "Admin" -> "Configurations"

**What you expected to happen**: available menu items in navigation panel
airflow/www/security.py
"""
        Add Website.can_read access to all custom roles.
        :return: None.
        """
        website_permission = self.create_permission(permissions.ACTION_CAN_READ, permissions.RESOURCE_WEBSITE)
        custom_roles = [role for role in self.get_all_roles() if role.name not in EXISTING_ROLES]
        for role in custom_roles:
            self.add_permission_to_role(role, website_permission)
        self.get_session.commit()
    def add_permission_to_role(self, role: Role, permission: PermissionView) -> None: