updated to slides most files

.gitmodules

slides/Makefile

slides/base_1.md

slides/base_2.md

slides/base_3.md

slides/base_4.md

slides/base_5.md

slides/base_6.md

slides/base_7.md

slides/base_X.md

slides/command_line.md

slides/css/styling.css

slides/css/tufte-css

slides/delaunay.md

slides/figs/Bowyer-Watson_0.png

slides/figs/Bowyer-Watson_1.png

slides/figs/Bowyer-Watson_2.png

slides/figs/Bowyer-Watson_3.png

slides/figs/Bowyer-Watson_4.png

slides/figs/Bowyer-Watson_6.png