Fix broken k8up.io urls

[zadjadr]

Summary

Some of the links are outdated so I adjusted them.

Checklist

For Code changes

• [ ] Categorize the PR by setting a good title and adding one of the labels: bug, enhancement, documentation, change, breaking, dependency as they show up in the changelog
• [ ] PR contains the label area:operator
• [x] Commits are signed off
• [ ] Link this PR to related issues
• [x] I have not made any changes in the charts/ directory.

For Helm Chart changes

• [ ] Categorize the PR by setting a good title and adding one of the labels: bug, enhancement, documentation, change, breaking, dependency as they show up in the changelog
• [ ] PR contains the label area:chart
• [ ] PR contains the chart label, e.g. chart:k8up
• [ ] Commits are signed off
• [ ] Variables are documented in the values.yaml using the format required by Helm-Docs.
• [ ] Chart Version bumped if immediate release after merging is planned
• [ ] I have run make chart-docs
• [ ] Link this PR to related code release or other issues.