Custom callout color

1. In a clone of this tests site, create _sass/custom/setup.scss containing:

   $pink-000: #f77ef1;
   $pink-100: #f967f1;
   $pink-200: #e94ee1;
   $pink-300: #dd2cd4;
   

2. In _sass/color_schemes/test.scss insert:

   $link-color: $pink-100
   

3. In _config.yaml replace:

     note:
       color: blue
   

   by:

     note:
       color: pink
       opacity: 0.3
   

4. Build the site.

5. Check that the Note callout is colored pink.