adds contact email
adds contact email

Former-commit-id: 565376a664de8290b6708f5fff965c954459e1b6 [formerly 63fc29899fdd6f3927edfd0c06fad37e5089015d]
Former-commit-id: 9301c352bcf9f8b050ae296ec21b202b409bcd1e
LibraryCarpentry/librarycarpentry.github.io,LibraryCarpentry/librarycarpentry.github.io,LibraryCarpentry/librarycarpentry.github.io