Mathematical formulae should be rendered with MathJax

[skalee]

We want to render MathML with MathJax.

Although modern browsers are capable of rendering MathML themselves, this support is sometimes buggy or feature-incomplete. See following example taken from IEV concept 103-01-02 (mind parenthesis and both horizontal and vertical positioning):

Firefox
Safari

For reference, actual HTML and MathML:

<p>An example of a functional of the function <math><mi>f</mi></math>(<math><mi>t</mi></math>) is <math><msubsup><mo>∫</mo><msub><mi>t</mi><mn>2</mn></msub><msub><mi>t</mi><mn>1</mn></msub></msubsup><mi>f</mi><mfenced open="(" close=")"><mi>t</mi></mfenced><mi>d</mi><mi>t</mi></math>.</p>

TODO

• [x] Add MathJax support to Jekyll-Geolexica (#110).
• [x] Enable MathJax on IEV site (https://github.com/glossarist/iev-demo-site/pull/52).

[skalee]

For reference, thanks to MathJax now it renders as follows:

Firefox
Safari

[ronaldtse]

Thanks @skalee !