set base font size to 16px

Allows for customers to "opt in" to accessibility compliance by setting this as "1rem" while avoiding the footgun probability that most are hard coding an HTML font size anyway which has the potential to cause sizing issues with fides.js out of the box.

clients/fides-js/src/components/fides.css

@@ -56,7 +56,7 @@
 
   /* Everything else */
   --fides-overlay-font-family: Inter, sans-serif;
-  --fides-base-font-size: 1rem;
+  --fides-base-font-size: 16px;
   --8px: calc(var(--fides-base-font-size) * 0.5);
   --12px: calc(var(--fides-base-font-size) * 0.75);
   --14px: calc(var(--fides-base-font-size) * 0.875);