Revert "add rails-dev-boost"

This reverts commit 4d460d7f1590272403237140e74d274cd8758fce.

dev-boost doesn't always work properly and affects classloading, meaning you have to keep restarting. It annoying and has annonyed other developers in the past
 - seek https://github.com/FAIRdom/seek/commit/dea50df