chore: add beta badge

web/src/components/BetaBadge.tsx

@@ -0,0 +1,13 @@
+import "../less/beta-badge.less";
+
+interface Props {
+  className?: string;
+}
+
+const BetaBadge: React.FC<Props> = (props: Props) => {
+  const { className } = props;
+
+  return <span className={`beta-badge ${className ?? ""}`}>beta</span>;
+};
+
+export default BetaBadge;