Right now we use codemirror's JavaScript mode on the website but there's a JSX mode now so we should start using that instead.

CodeMirror.defineMode("javascript", function(config, parserConfig) {
  var indentUnit = config.indentUnit;
  var jsonMode = parserConfig.json;
  var isTS = parserConfig.typescript;
  
  var keywords = function(){
    function kw(type) {return {type: type, style: "keyword"};}