If the user cannot do something don’t show the button

[jacobatan]

For our permissions, MANAGE_MEETINGS, and MANAGE_ROLES, we want to hide the create role and create meeting button if the user doesn't have these permissions

• [x] if the user doesn't have view_roles permission, don't show them the role's page entirely
• [x] if the user doesn't have manage_meetings permission, don't show them the new meeting button
• [x] if the user doesn't have manage_roles button, don't show them the plus sign in roles page

[TylerDonghwi]

I think if the user doesn't have the permission to view_roles, you should hide the roles page completely.