Removed deleted document-fixtures.js

document-fixtures.js was removed in commit: 6f9836331d8b714ab271bb391310d0e3747a50c0 but is still called in index.html.  This removes it.
Merge pull request #16 from traeblain/missing-js

Removed deleted document-fixtures.js
remove document fixtures
Merge branch 'master' of github.com:segmentio/socrates
added symbolset scss file, fixed monospace
escaping titles
add title attribute to buttons
Update index.html
Merge pull request #19 from jangxyz/patch-1

add title attribute to buttons
fixing mathjax to only do $$ and \[, fixes #20
adding print styles from @SimpleAsCouldBe
refined print styles, and compiled
fixing blank slate
merging with master from segmentio