Shared Config with common YML almost deprecated

[DanielCender]

Per this discussion in the Serverless repo, soon the ability to access a shared configuration outside the individual services' directory will no longer be possible without experiencing thrown errors.

As such, likely this page and others will need heavy editing or removal altogether: https://github.com/AnomalyInnovations/serverless-stack-com/blob/c96cca4fe48fa26c4379c3d2fb7d694cccace9f8/_chapters/share-code-between-services.md