Delete documentation about exercise readmes
Delete documentation about exercise readmes

This has been moved to the project-wide documentation in
https://github.com/exercism/docs/blob/master/contributing-to-language-tracks/exercise-readmes.md

RaptorRCX/exercism.io,tejasbubane/exercism.io,RaptorRCX/exercism.io,tejasbubane/exercism.io,RaptorRCX/exercism.io,tejasbubane/exercism.io,RaptorRCX/exercism.io,tejasbubane/exercism.io