Improve security: HSTS, Force SSL, CSP

app/assets/javascripts/mathjax-config.js

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+window.MathJax = {
+    jax: ["input/TeX", "output/HTML-CSS"],
+    tex2jax: {
+        inlineMath: [ ["$","$"], ["\\(","\\)"] ],
+        displayMath: [ ["$$","$$"], ["\\[","\\]"] ],
+        processEscapes: true
+    },
+    "HTML-CSS": { availableFonts: ["TeX"] }
+};