Make the OLP accessible

[rzach]

• Use Universal Design principles: http://opentextbc.ca/accessibilitytoolkit/chapter/universal-design/
• Make the LaTeX accessible
  • add tags to formulas, see http://ceur-ws.org/Vol-1010/paper-01.pdf
  • possibly use accesibility-meta package https://github.com/AndyClifton/AccessibleMetaClass

[rzach]

The way to go may be to make sure you can compile it to HTML using LaTeXML https://github.com/brucemiller/LaTeXML/. This is currently blocked by brucemiller/LaTeXML#2064 -- LaTeXML has issues with expl3 which we use a lot.