[Bug] Hacktoberfest program card navigates to /programs/null instead of valid slug

Description

On https://layer5.io/careers/internships, the Hacktoberfest program card navigates to https://layer5.io/programs/null instead of a valid URL. The slug for this program is incorrectly set to null in the data file, causing an invalid URL to be generated by Gatsby.

Page: https://layer5.io/careers/internships

Steps to Reproduce:

1.Go to https://layer5.io/careers/internships
2.Scroll to "Open Source Internship Programs" section
3.Click on the "Hacktoberfest" card
4.Observe URL becomes layer5.io/programs/null

Expected Behavior

The Hacktoberfest card should navigate to a valid URL such as https://layer5.io/programs/hacktoberfest, consistent with the slug pattern used by other program cards like /programs/lfx, /programs/gsoc, /programs/mlh etc.

Screenshots

Environment:

-Host OS: macOS
-Browser: Chrome