Use WooCommerce with only a checkout page

wc-only-checkout.php

<?php

/*
I built custom product pages with a simple add to cart button(using the add_to_cart shortcode) for a webshop.
There was no need for category pages, shop pages, cart or anything like that, just a simple product page with an add to cart button that redirects to checkout directly.
Here is how you can do this:
1. Delete the My Account page
2. Delete the Shop page
*/

//Redirect cart to checkout or homepage(if empty)
add_action( 'template_redirect', function(){
	if ( is_cart() ) {
		if(WC()->cart->cart_contents_count > 0) {
			wp_redirect( wc_get_checkout_url(), '301' );
		} else {
			wp_redirect( home_url() );
		}
		exit;
	}
});

//Disable single product archives and category archives
add_filter('woocommerce_register_post_type_product', 'disable_wc_tax_publicly_queryable');
add_filter('woocommerce_taxonomy_args_product_cat', 'disable_wc_tax_publicly_queryable');
function disable_wc_tax_publicly_queryable($args) {
  $args['publicly_queryable'] = false;
	return $args;
}