Add env variable for default channel

[timuric]

Since storefronts can be used with different datasets, the default channel slug should be configurable via .env

• Add variable to .env.examples
• Use variable across the codebase
• Default slug should be aligned with the most common Saleor dataset

[bertoldoklinger]

Hi there! this will affect the url path? whats your point of view on this? we could change the path from '/default-channel' to '/' via .env?

[timuric]

Hi there! this will affect the url path? whats your point of view on this? we could change the path from '/default-channel' to '/' via .env?

I think channel information should not belong in url in most use cases, instead it should be mapped to a locale