feat: adding data theme light attribute to stylesheet to provide dynamic theming (#627)

Author: georgewrmarshall

src/css/design-tokens.css

@@ -5,7 +5,8 @@
  * theme compatible styles
  */
 
-:root {
+:root,
+[data-theme='light'] {
   --brand-colors-white-white000: #ffffff;
   --brand-colors-white-white010: #fcfcfc;
   --brand-colors-black-black000: #000000;