temp: add demo page for showing off render-math features

Author: Swiftb0y

content/news/XXXX-XX-XX-render-math-test.md

@@ -0,0 +1,11 @@
+title: Now featuring MathJax
+authors: Nikolaus Einhauser
+status: draft
+comments: yes
+math: yes
+
+Here's a pretty formula I like:
+
+$$ \sum_{i=1}^{n}{i} = {n(n + 1) \over 2 }$$
+
+also with inline $a_i$ variables