docs (docusaurus.config.js): replace placeholder text with live site’s url (#11)

Author: CBID2

docusaurus.config.js

@@ -11,7 +11,7 @@ const config = {
     v4: true,
   },
 
-  url: 'https://your-docusaurus-site.example.com',
+  url: 'https://refract-docs-green.vercel.app',
   baseUrl: '/',
 
   organizationName: 'facebook',
@@ -155,4 +155,4 @@ const config = {
     }),
 };
 
-export default config;
+export default config;