remove DC closes #17
remove DC closes #17

Former-commit-id: a706952496178b5671f7d2a96944eedfc2133bcb [formerly bc93c15c5547778056e08916d6ce8d983a865d0b]
Former-commit-id: 185f539e910d08978da206c6ebe7049a30bb87fa
LibraryCarpentry/librarycarpentry.github.io,LibraryCarpentry/librarycarpentry.github.io,LibraryCarpentry/librarycarpentry.github.io