Adding links to the left nav

Author: theManikJindal

gatsby-config.js

@@ -10,6 +10,10 @@
  * governing permissions and limitations under the License.
  */
 
+
+// DO NOT EDIT THIS FILE ANYMORE. 
+// DELETE IT AFTER VERIFYING THAT ALL LINKS ARE PRESENT IN config.md FILE.
+
 module.exports = {
   siteMetadata: {
     pages: [

src/pages/config.md

@@ -41,6 +41,10 @@
             - [Migration FAQs](guides/authentication/ServerToServerAuthentication/faqs.md) 
             - [API Reference](guides/authentication/ServerToServerAuthentication/ims.md) 
         - [API Key Authentication](guides/authentication/APIKeyAuthentication/index.md) 
+        - [Admin Authentication](guides/authentication/AdminAuthentication/index.md) 
+            - [Implementation Guide](guides/authentication/AdminAuthentication/implementation.md) 
+            - [Sample Code](guides/authentication/AdminAuthentication/samples.md)
+            - [API Reference](guides/authentication/AdminAuthentication/ims.md) 
         - [Tools](guides/authentication/Tools/index.md) 
             - [OAuth 2.0 Playground](guides/authentication/Tools/o-auth-playground.md) 
             - [Postman](guides/authentication/Tools/postman.md)