docs: remove ga (#4462)

Author: moskalakamil

docs/theme.config.jsx

@@ -32,18 +32,6 @@ export default {
         type="image/png"
         href="https://docs.thewidlarzgroup.com/react-native-video/favicon.png"
       />
-      <script
-        async
-        src="https://www.googletagmanager.com/gtag/js?id=G-4YEWQH5ZHS"
-      />
-      <script>
-        {`
-          window.dataLayer = window.dataLayer || [];
-          function gtag(){dataLayer.push(arguments);}
-          gtag('js', new Date());
-          gtag('config', 'G-4YEWQH5ZHS');
-        `}
-      </script>
     </>
   ),
   logo: (