Removing developer standards page

This file is almost entirely out-of-date or irrelevant and Josh has agreed that I remove it and he will re-instate anything he wants to keep at a later date. See cards - https://trello.com/c/jpAvIxbB/182-developer-standards and https://trello.com/c/wtlQnuia/166-update-contributing-docs-team-communication-standards-pages