Remove the inline MathJax configuration

[emichael]

As mentioned in mathjax/MathJax#256, the only time 'unsafe-inline' or 'unsafe-eval' are needed in the CSP for scripts is when there is inline MathJax configuration. As soon as the patch is released, upgrade the version of MathJax used in the extension, and remove the unsafe JavaScript option entirely.

[emichael]

Okay, I finally know how to do this. I simply have to insert a the config into the properties of some node, and then use a JS script in the page's context to parse it and set the MathJax config.