Update about.md
Update about.md

change links over and remove "Lesson"

Former-commit-id: bf1e341f2f77c4d81b260c965fb256176123d1fa [formerly 97348d6c0c0488dc9c32d5d4f0127265c4f9599f]
Former-commit-id: b829fe9dae00f712f171111a0f6885211b0944c4
LibraryCarpentry/librarycarpentry.github.io,LibraryCarpentry/librarycarpentry.github.io,LibraryCarpentry/librarycarpentry.github.io