Update navigation.yml
Update navigation.yml

remove "Lesson" from maintainers

Former-commit-id: 1620cfd2bf224861c3ed62867b3343aee2487177 [formerly 8d2c0a23528c1357dffff90de47505cf5cbecbf3]
Former-commit-id: fe24941328115a8d49902e62034c9e546480f2a7
LibraryCarpentry/librarycarpentry.github.io,LibraryCarpentry/librarycarpentry.github.io,LibraryCarpentry/librarycarpentry.github.io