Remove support for MathJax (#613)

Alphonse Mariya

02.49.2021 3c132254988c872e955b8b024e009a2ba0c8fb05

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// Functions
// --------------------------
 
// Helper function which adds quotes to preserve unicode values in CSS output.
//
// See: https://github.com/sass/sass/issues/1395
// See: https://stackoverflow.com/questions/30421570/sass-unicode-escape-is-not-preserved-in-css-file
 
@function fa-content($fa-var) {
  @return unquote("\"#{$fa-var}\"");
}