fix newsletter page
fix newsletter page


Former-commit-id: 770749ec62b1a610623fe760ddc4f77aef40452e [formerly 43852cd2d177f86af301a211c008e7d570cd9e6a]
Former-commit-id: 39206c0ddacb282740164da5175699624905e89b
LibraryCarpentry/librarycarpentry.github.io,LibraryCarpentry/librarycarpentry.github.io,LibraryCarpentry/librarycarpentry.github.io