Update README.md with banner and blurb about main repo and blog post

Author: earlduque

README.md

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+<img width="1280" height="250" alt="actionpack banner" src="https://github.com/user-attachments/assets/08926d1f-7bda-433f-91af-23fb0a2cde0b" />
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 # ActionPack: An action-packed pack of Flow Actions!
 
 Welcome to ServiceNow's ActionPack community repository, managed by the Developer Program and the sndevs Slack community.
 
+> Interested in our other ServiceNow Hacktoberfest projects? See the main repository [here](https://github.com/ServiceNowDevProgram/Hacktoberfest) or see our official blog post [here](https://devlink.sn/hacktoberfest).
+
 ### Have you ever looked for an action in Workflow Studio, only to find that an appropriate utility or action is missing? 
 
 ActionPack is designed to address this problem by croudsourcing action definitions across the ServiceNow community that can be used by developers! It is built on the principle of "Many hands make light work", and is available for download and use in any ServiceNow instance.
@@ -61,4 +65,4 @@ To contribute, just follow these steps:
     - [Legacy Studio Commit Changes Instructions](https://www.servicenow.com/docs/bundle/yokohama-application-development/page/build/applications/task/t_CommitChanges.html)
 9. Submit a pull request to the ServiceNowDevProgram/ActionPack `main` branch
 
-That's it! More detailed contribution instructions can be found [here](CONTRIBUTING.md)
+That's it! More detailed contribution instructions can be found [here](CONTRIBUTING.md)