Update index.md

Author: Bangkah

content/rest/guides/index.md

@@ -20,7 +20,6 @@ children:
   - /building-a-ci-server
   - /using-the-rest-api-to-interact-with-your-git-database
   - /using-the-rest-api-to-interact-with-checks
-  - /encrypting-secrets-for-the-rest-api
 ---
 This section of the documentation is intended to get you up-and-running with
 real-world {% data variables.product.github %} API applications. We'll go over everything you need to know, from authentication to results manipulation to integrating results with other apps.