Remove or disable button opencart

As you know opencart is Ecommerce which is meant to sell product online so there is no feature of removing add to cart.

If you want you can do it in a custom way by disabling the addToCart() operation

catalog>view>javascript>common::addToCart() comment the operational part 
system>library>cart::add() comment the operational part 

This will help to disable the function of addToCart()

To remove add to cart button add script to footer.tpl before </body>

<script type="text/javascript">
$('.cart, #cart').hide();
</script>