Update _config.yml
Update _config.yml

try one more

Former-commit-id: 23e8fa9beafcf058b8dbbea83280eb5a77805f5e [formerly 90d92de5d23c4c3cd43b38070fd27de14a8c36f7]
Former-commit-id: a24afba8dbc5fcb9c7fed4c4b669688ed3e756ae
LibraryCarpentry/librarycarpentry.github.io,LibraryCarpentry/librarycarpentry.github.io,LibraryCarpentry/librarycarpentry.github.io