docs: add deprecation notice

Author: UlisesGascon

README.md

@@ -1,3 +1,5 @@
+**:warning: This repo is archived now, please use [OpenPathfinder](https://openpathfinder.com/docs/getting-started). All the information has been transfered to the new website :warning:**
+
 # OpenJS Security Program Standards
 
 This repo contains the source code and infra used to build and the deploy the website: https://openjs-security-program-standards.netlify.app/.
@@ -70,4 +72,4 @@ If you want to enhance any page, you can do so as you would in any other project
     AVOID (AUTOMATED)
     <!-- DESCRIPTION:END -->
     OK
-    ```
+    ```