Hubert / Fix link to playground (#282)

Author: hubert-deriv

src/components/api-guide/ApiGuide/DerivGuideContent/DerivGuideContent.tsx

@@ -251,8 +251,7 @@ export const DerivGuideContent = () => {
                 <li>
                     <p>
                         Specify the URL that will be used as the OAuth Redirect URL on the{' '}
-                        <a href='https://developers.binary.com/applications/'>API registration</a> page in the 'Website
-                        URL' field.
+                        <a href='/app-registration'>app registration</a> page in the 'Website URL' field.
                     </p>
                 </li>
                 <li>