remove scss since using the simple style

Author: chaitanyarahalkar

assets/stylesheets/application.css.scss

@@ -131,7 +131,6 @@
         'pages/tcl_tk',
         'pages/tensorflow',
         'pages/terraform',
-        'pages/threejs',
         'pages/typescript',
         'pages/underscore',
         'pages/vue',