fix some errors and add improvements

Author: Svetloslav15

README.md

@@ -4,7 +4,6 @@
 
  [![NPM](https://img.shields.io/npm/v/react-sidebar-ui.svg)](https://www.npmjs.com/package/react-sidebar-ui)
 [![NPM Downloads](https://img.shields.io/npm/dt/react-sidebar-ui.svg)](https://www.npmjs.com/package/react-sidebar-ui)
-[![Buy me a coffee](https://www.buymeacoffee.com/assets/img/custom_images/orange_img.png)](https://www.buymeacoffee.com/svetloslav)
 <br/>
 ![React Sidebar UI Black](https://i.imgur.com/gXPJtJW.gif)
 ![React Sidebar UI Light](https://i.imgur.com/QT86Om0.gif)