deprecation warning

Booyah! Make sure people don't end up on this repo by accident. Just a documentation update. Part of https://zendesk.atlassian.net/browse/TOOLS-20

Do you guys think we'll break anything if a new version of alpha_omege suddenly appears. Normally I'd assume no, but I know a ton of old code still uses this, and it seems pretty hacky already.

@staugaard @morten