removed duplicate React import

Signed-off-by: ilazarkov <ilazarkov@gmail.com>

Author: IhorLazarkov

site/gatsby-browser.js

@@ -1,6 +1,5 @@
 import React from "react";
 import { ThemeProvider } from './src/components/Theme';
 import './src/styles/global.css';
-import React from "react";
 
 export const wrapRootElement = ({ element }) => <ThemeProvider>{element}</ThemeProvider>;