Update Hacktoberfest docs for 2023.

hacktoberfest.md

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+# Hacktoberfest and Tekton!
+
+## What's this about?
+
+We'd love to encourage folks to contribute to Tekton - and over at the
+[Continuous Delivery Foundation](https://cd.foundation/) we've decided something
+like this could come in handy.
+
+## Guidance for project maintainers
+
+When creating a new issue for Hacktoberfest, please assign it the Hacktoberfest
+label and make sure you provide at least:
+
+- A perceived difficulty level
+- Awesome contacts/mentors willing to help out
+- An idea of what we'd like to achieve
+- Any useful pointers for getting started
+
+## Guidance for contributors
+
+The below links all contain the label selector for Hacktoberfest and there you
+can find all of the issues that the maintainers think would be good ones to get
+involved in.
+
+We encourage all of the following:
+
+- Sharing ideas and progress
+- Mentoring others
+- Challenging yourself
+- Bringing others in to contribute
+- Asking for help and making new contacts
+
+If there's any doubt please don't hesitate to contact the issue creator or the
+project maintainers - we'd love to help out!
+
+If you start addressing an issue please assign yourself to it by posting the
+`/assign` message in the issue; this will help maintainers know exactly who is
+working on it and let others know that the issue has already been picked up by
+someone.
+
+## Project ideas with Hacktoberfest queries
+
+- [Results](https://github.com/tektoncd/results/labels/Hacktoberfest)
+- [Pipeline](https://github.com/tektoncd/pipeline/labels/Hacktoberfest)
+
+## More information on Hacktoberfest, recognition and our FAQ!
+
+Check out our [CDF Hacktoberfest page!](https://cd.foundation/hacktoberfest/) If
+anything's unclear please reach out to the CDF on
+[our CDF Slack](https://cdeliveryfdn.slack.com).
+
+You can also refer to the
+[official guidelines](https://hacktoberfest.com/participation/)
+(including the label to use and the topics for each repo we should have).