Configure Logback for Core module

Background
This issue is related to issue https://github.com/devonfw/devon4j/issues/38, for logging  correlation ID in performance logs. Currently there seem to be no Logback configuration in place for Core module.
Current Behaviour
Correlation ID is not getting logged.
Expected Behaviour
Correlation ID should be logged when application is run as Spring Boot application from Core module.

Create issue in devon4j project https://github.com/devonfw/devon4j/issues/56


Don't show buy when it's not for sale

I guess we don't want to show the buy button when art is not on sale, even it's disabled?
But hence we can show related NFTs from particular collection/artist re #990
happened at https://deploy-preview-2558--koda-nuxt.netlify.app/rmrk/gallery/10279780-0a8ce195286c168f19-DONKEY-DONKEY_GANG_120-0000000000000120

Ref

https://github.com/kodadot/nft-gallery/issues/957
https://github.com/kodadot/nft-gallery/issues/990

Hi, I will work on this.