Delete header_unsplash_2-970x.jpg
Delete header_unsplash_2-970x.jpg

Former-commit-id: 2b99436a2faf26e7fa1aa45172c9d6c32d8781a7 [formerly 66c705180639322f66874f65e77cbc9ae4979d8e]
Former-commit-id: a6f4c534ad679a4fa4556b0a7d35fbfe4a3e5aaa
LibraryCarpentry/librarycarpentry.github.io,LibraryCarpentry/librarycarpentry.github.io,LibraryCarpentry/librarycarpentry.github.io