Remove the "add more items" button in cart

[ChefBobB]

Hello. I would like to remove/disable the "add more items" button in the checkout cart. Is there a way to do this? We take down portions of our site at times and it is super inconvenient to have to make all those items "unavailable" to keep them from being accessible from the "add more items" button (only to have to make all these items visible again when we bring that portion of the site back online in a week).