Added new template with demo and quick install.

Added template demo and quick install. The template is implemented with the ability to change the color scheme in the design editor.
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Install template.

Added new template with demo and quick install.

Added [product_group_id] for Google Merchant, as well as a field for specifying the Type of variation.Added the ability to massively change categories of product cards on the page for viewing and managing the list of products.Added the function to hide certain payment methods when choosing a shipping method