Hide variants that is out of stock

Add the following in variant-main-picker.liquid

{%- for product_option_value in product_option.values -%}

{% # hide variants = 0 # %}

{% if product_option_value.available == false %}

{% continue %}

{% endif %}

{% # End hide variants = 0 # %}

{% if product_option_value.size > longest_value and option_id_attribute %}

{% assign longest_value = product_option_value.size %}

{% endif %}