Lint and clean-up

.eslintrc.js

@@ -42,6 +42,8 @@ module.exports = {
                 showdownKatex: 'readonly',
                 SVGInject: 'readonly',
                 toastr: 'readonly',
+                Readability: 'readonly',
+                isProbablyReaderable: 'readonly',
             },
         },
     ],