Update navigation.yml
Update navigation.yml

reorder and add Trainers

Former-commit-id: efeb1289233ae40705e7341b88b17cbeef1fafc2 [formerly 3ff9221eb29659c906ca412ff750404e85fa277d]
Former-commit-id: 29e642e2c2f7bd51590f5d2858d495a0e5422718
LibraryCarpentry/librarycarpentry.github.io,LibraryCarpentry/librarycarpentry.github.io,LibraryCarpentry/librarycarpentry.github.io