Update styles and templates for improved checkout experience

- Adjusted CSS styles in custom.css and custom.scss for better layout and responsiveness, including changes to button sizes and margins.
- Updated the checkout button link in ps_shoppingcart.tpl to directly point to the order page.
- Changed text labels in cart-voucher.tpl for better localization.
- Modified continue shopping button text in cart.tpl to Polish.
- Enhanced index.tpl structure for better hook management and layout consistency.
- Added temporary image files in the checkout module for future use.

modules/thecheckout/controllers/front/front.php

@@ -2175,7 +2175,7 @@ class TheCheckoutModuleFrontController extends ModuleFrontController
 
         // // Payment data, used by Stripe payment for live refresh (and possibly other modules in future)
 
-        // $currency = $this->context->currency->iso_code; 
+        // $currency = $this->context->currency->iso_code;
         // $orderTotal = $this->context->cart->getOrderTotal();
         // $stripeAmount = Tools::ps_round($orderTotal, 2);
         // $stripeAmount = $this->isZeroDecimalCurrency($currency) ? $stripeAmount : $stripeAmount * 100;