feat: add screen reader only class

Author: RickEyre

packages/panda-san/src/core/utils.scss

@@ -1,3 +1,12 @@
 .hidden {
   display: none;
 }
+
+.is-sr-only {
+  height: 1px !important;
+  left: -100000px !important;
+  overflow: hidden !important;
+  position: absolute !important;
+  top: auto !important;
+  width: 1px !important;
+}