0-readme edit

<!-- components/0-readme/sass-resources.php --> <h5>SASS overview</h5> <ul> <li>Excellent SASS overview: <a href="https://www.slideshare.net/knoldus/deep-dive-into-sass" target="_blank">Deep Dive into SASS</a></li> <li><a href="https://devhints.io/sass" target="_blank">SASS cheatsheet</a></li> </ul> <p><a href="atomic-core/?cat=0-readme#site-variables">Learn about the SASS variables, functions, and mixins used in the W&M site theme.</a></p>