Update maintainers list and headlamp repo

[illume]

Headlamp moved to the Kubernetes Sigs org on github.

Pre-submission checklist for maintainer updates (delete this if you're updating a different file)

If you're adding a new maintainer to the CSV file, please review each of these actions as well:

• [x] You've provided a link to documentation where the project has approved the maintainer changes.
• [x] The maintainer(s) also created or updated their LFX Individual Dashboard profile.
• [ ] You've sent an email with the email address(es) to [email protected] for invitations to Service Desk and mailing lists.
• [x] Optional: You've also sent a PR with affiliation updates to cncf/gitdm.

cc ,@sniok, @vyncent-t, @skoeva, @knrt10

[krook]

@illume can you please send an email with the email addresses for @sniok, @vyncent-t, and @skoeva to [email protected] for invitations to Service Desk and mailing lists.