Revert "Updates librarian-chef and Cheffile site"

This reverts commit 3e312c1774b989ed0766f1623082fbbd15e023ac.
Updates only librarian-chef not it's dependencies

Uses bundle update --source=librarian-chef which will only update the source gem and required dependencies, not all depenencies. There is an issue with json versions when all dependencies are updated.  Something to do with json 1.8.1 and 1.7.7

Also updates the cheffile site.
Merge pull request #57 from pivotal-sprout/update-librarian-chef-75083494

Updates only librarian-chef not it's dependencies

Uses `bundle update --source=librarian-chef` which will only update the source gem and required dependencies, not all depenencies. There is an issue with json versions when all dependencies are updated.  Something to do with json 1.8.1 and 1.7.7

Also updates the Cheffile site.
[#75083494]
Merge remote-tracking branch 'upstream/master' into vdp