Demo quick-fix

package.json

@@ -49,7 +49,7 @@
     "eslint": "^7.0.0",
     "express": "^4.14.0",
     "gh-pages": "^2.2.0",
-    "highlight.js": "^10.0.3",
+    "highlight.js": "^9.18.1",
     "markdown-it-abbr": "^1.0.4",
     "markdown-it-container": "^2.0.0",
     "markdown-it-deflist": "^2.0.0",

support/demo_template/index.js

@@ -55,7 +55,6 @@ hljs.registerLanguage('smalltalk',    require('highlight.js/lib/languages/smallt
 hljs.registerLanguage('stylus',       require('highlight.js/lib/languages/stylus'));
 hljs.registerLanguage('swift',        require('highlight.js/lib/languages/swift'));
 hljs.registerLanguage('tcl',          require('highlight.js/lib/languages/tcl'));
-hljs.registerLanguage('latex',        require('highlight.js/lib/languages/latex'));
 hljs.registerLanguage('typescript',   require('highlight.js/lib/languages/typescript'));
 hljs.registerLanguage('verilog',      require('highlight.js/lib/languages/verilog'));
 hljs.registerLanguage('vhdl',         require('highlight.js/lib/languages/vhdl'));