docs(examples) 🎨: Fix dayClassName specificity issue

- Previous `text-success` color style was overridden by the default specificity of the react-datepicker__day class.
- Added a new class to increase the specificity

Author: balajis-qb

docs-site/src/components/Examples/examples.scss

@@ -212,3 +212,16 @@
   font: inherit;
   color: #fff;
 }
+
+.react-datepicker__day {
+  &.highlighted-day {
+    background-color: #ccc;
+    color: #000;
+    border-radius: 0.3rem;
+
+    &:not([aria-disabled="true"]):hover {
+      background-color: #aaa;
+      color: #000;
+    }
+  }
+}

docs-site/src/examples/ts/customDayClassName.tsx

@@ -2,7 +2,7 @@ const CustomDayClassName = () => {
   const [selectedDate, setSelectedDate] = useState<Date | null>(new Date());
 
   const getDayClassName = (date: Date): string => {
-    return date.getDate() === 1 ? "text-success" : "";
+    return date.getDate() === 1 ? "highlighted-day" : "";
   };
 
   return (