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.

themes/charme/templates/_partials/head.tpl

@@ -54,7 +54,7 @@
   {include file="_partials/stylesheets.tpl" stylesheets=$stylesheets}
 {/block}
 
-<link rel="stylesheet" href="/themes/charme/assets/css/custom.css?ver=1.0109">
+<link rel="stylesheet" href="/themes/charme/assets/css/custom.css?ver=1.0121">
 
 {block name='javascript_head'}
   {include file="_partials/javascript.tpl" javascript=$javascript.head vars=$js_custom_vars}