Add CSS for printing

The CSS was add at our main CSS and remove from printing:

- Logo at header
- GitHub ribbon
- Footnote

Close #561.
Shrink the font size for print version
Updating README with description of Windows installer
Corrected the order of the images in the Git Conflicts section.
Fixed reference link
Added link to Gnu Make manual
Updated language in intro module.
Added definition of graph to glossary
Testing makefile syntax hilighting mode
Testing makefile syntax hilighting mode 2
Revert "Testing makefile syntax hilighting mode 2"

This reverts commit e3871559de4dceee440036bd9a79265ea3596a53.
Revert "Testing makefile syntax hilighting mode"

This reverts commit 424320ee075457a2b2188c8ee168b902260bd989.
Added glossary references for Make lesson
Python file for generating mock datasets
Scripts and dependencies for make example
Updated mk files to be runable
Updated language in lessons to reflect examples
Quelled display window in matplotlib
Have matplotlib plot figure without X11 window
Changed Makefile to only create data sets not svg