Generate the json schema for config file

[antonlisovenko]

Hi guys.

Would be great if devspace provided the json schema generated by the Go struct for the config. Quick googled this https://github.com/alecthomas/jsonschema

Having json schema allows to import it to an IDE and get an auto-completion/validation support while editting config.

thanks for the great product!

[FabianKramm]

@antonlisovenko thanks for creating this issue! Yes, I think we could add a json schema

[leventogut]

Duplicate of #1146