Bad links in Appendix B Quick References

While the links are OK in the original cheat sheet https://github.com/rougier/scientific-visualization-book/blob/master/figures/cheatsheets/cheatsheets.pdf, they get corrupted in the individual sheet 1 https://github.com/rougier/scientific-visualization-book/blob/master/figures/cheatsheets/cheatsheets-1.pdf and hence in the book:

(this may or may not be linked to switch to Font Awesome for icons and brand logos).