b1e9a7ba

By: Greg Pfeil <greg@technomadic.org>

Update READMEs to point at the contributor guide

These have historically duplicated a lot of information that is consistent
across projects. Instead, point at the common location.
formatterproject-manager-filesvaleconfigurebashcdevShelldhallemacs-lisphaskellnixproject-managerrustscalax86_64-linuxdefaultmanagement-scriptsx86_64-linux