Update community.md
Update community.md

formatting changes

Former-commit-id: 9704f50abef891f40209b3fd86af554469cd6f92 [formerly e3d0e4f49c581b83e5317eb605818df8a7f19850]
Former-commit-id: 72738bded143cedaa97fa5106cbae7d0934d76ec
LibraryCarpentry/librarycarpentry.github.io,LibraryCarpentry/librarycarpentry.github.io,LibraryCarpentry/librarycarpentry.github.io