Automate lemonsquezy setup

[Ekwav]

The store id is somewhat hard to find and should be replaced in config with the name.
To have the id at hand it should be queried at startup via "https://api.lemonsqueezy.com/v1/stores"
same for variants with the intermediate step of products.
Also webhook should be automatically created via POST /v1/webhooks with SECRET and a to be added callback_url