Added description of mathjax plugin

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+[[!template id="plugin" name="mathjax" author="Baldur Kristinsson"]]
+
+The [mathjax plugin](https://github.com/bk/ikiwiki-plugin-mathjax), available on GitHub, provides easy MathJax support for ikiwiki.
+
+Features:
+
+- No change needed to page.tmpl
+- Javascript is only loaded on pages which need it.
+- Both inline and display math are supported.
+- Unlike [[the pandoc plugin|plugins/contrib/pandoc]] or a solution based on editing page.tmpl, no irritating conflicts with the smiley plugin.
+- Unlike the pandoc plugin, it is easy to use in shared hosting or other environments where you have difficulty in installing extra software (beyond Perl modules, obviously).
+
+However, if you need the power of Pandoc, such as bibliography support or pdf generation, then that is probably the better option for you.