Check / move coupon settings to env

[willemvb]

https://github.com/spatie/medialibrary.pro/blob/full-promo/resources/views/partials/pricecard.blade.php#L1-L8

Can you check and move these settings to env variables?

[freekmurze]

As discussed last week, I have already made some adjustments in the laravel-beyond-crud.com repo (branch: add-coupon-component).

Could you review the changes there? If they seem ok, I'll copy those changes to medialibrary.pro.

[willemvb]

Updated this in laravel-beyond-crud.com and here as well: https://github.com/spatie/medialibrary.pro/commit/0f55cb54e82496461d96e183da76646f5dd461fb

• everything in .env
• added a promo label for display eg. "Launch promo…"
• script updated: original price strike-through, price with discount applied big
• show only 1 price when there is no discount