use mathjax at 2.7.5

Author: archmoj

package-lock.json

@@ -163,7 +163,7 @@
     "karma-viewport": "^1.0.7",
     "lodash": "^4.17.20",
     "madge": "^3.12.0",
-    "mathjax": "2.7.9",
+    "mathjax": "2.7.5",
     "minify-stream": "^2.1.0",
     "mkdirp": "^1.0.4",
     "node-sass": "^5.0.0",

package.json

@@ -59,7 +59,7 @@ function getInfoContent() {
         '```',
         '',
         'You can get the relevant MathJax files from the internet e.g.',
-        '"https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.9/MathJax.js?config=TeX-AMS-MML_SVG.js"',
+        '"https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.5/MathJax.js?config=TeX-AMS-MML_SVG.js"',
         '',
         'By default, plotly.js will modify the global MathJax configuration on load.',
         'This can lead to undesirable behavior if plotly.js is loaded alongside',