Moved code into src folder. Added build for component library.

src/components/hooks/useDocumentClick.js

@@ -0,0 +1,15 @@
+import { useEffect } from 'react';
+
+export function useDocumentClick(handler) {
+  useEffect(() => {
+    document.addEventListener('click', handler);
+
+    return () => {
+      document.removeEventListener('click', handler);
+    };
+  }, [handler]);
+
+  return null;
+}
+
+export default useDocumentClick;