Add deployment instructions in contributing doc
Add deployment instructions in contributing doc

Closes #3548

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