Update _config.yml
Update _config.yml

amend

Former-commit-id: 655353865124e2dca9f9de3b07354d568ec54c0b [formerly 9c2d25ac302bddd63bbb20380a5c8378bed13005]
Former-commit-id: 4e5a48a34dd3ddecb695d5bf6aa0ff071c20279d
LibraryCarpentry/librarycarpentry.github.io,LibraryCarpentry/librarycarpentry.github.io,LibraryCarpentry/librarycarpentry.github.io