Update app.py

app.py

@@ -88,9 +88,6 @@ h3 {
 
 space_js = """
 <script src="https://cdn.jsdelivr.net/npm/@rapideditor/[email protected]/dist/country-coder.iife.min.js"></script>
-<script type="text/javascript"
-  src="http://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.1/MathJax.js?config=TeX-AMS-MML_HTMLorMML">
-</script>
 <script>
 function shortcuts(e) {
     var event = document.all ? window.event : e;