Revert "Restore the locations of highlight.js files"

Author: mbauman

.prettierignore

@@ -1,8 +1,3 @@
 import DiscourseRecommendedTheme from "@discourse/lint-configs/eslint-theme";
 
-export default [
-  {
-    ignores: ["src/languages/*.js"]
-  },
-  ...DiscourseRecommendedTheme
-];
+export default [...DiscourseRecommendedTheme];