resolves #188 add lua as supported language in syntax highlighter

Author: mojavelinux

src/js/vendor/highlight.bundle.js

@@ -18,6 +18,7 @@
   hljs.registerLanguage('javascript', require('highlight.js/lib/languages/javascript'))
   hljs.registerLanguage('json', require('highlight.js/lib/languages/json'))
   hljs.registerLanguage('kotlin', require('highlight.js/lib/languages/kotlin'))
+  hljs.registerLanguage('lua', require('highlight.js/lib/languages/lua'))
   hljs.registerLanguage('markdown', require('highlight.js/lib/languages/markdown'))
   hljs.registerLanguage('nix', require('highlight.js/lib/languages/nix'))
   hljs.registerLanguage('none', require('highlight.js/lib/languages/plaintext'))