Review 2 broken links

[lah7]

I've added a new workflow that does a bit of proofing for https://guide.ubuntu-mate.org, but won't block publishing if it finds anything wrong.

At the moment, there are currently two dead links:

  *  External link http://goinglinux.com/articles/Backups.html failed: 404 No error
  *  External link http://www.dell.com/support/article/us/en/19/how12108/how-to-enable-the-ubuntu-super-key-on-dell-oem-ubuntu-installations?lang=en failed: 403 No error

[goinglinux]

Hi Luke, The first dead link is because I redesigned the website. You can replace it with this one https://goinglinux.com/backup-strategies-for-your-computer/ The second is dead because Dell no longer requires enabling the super key and has removed the post from their support website. Just remove the text "Do you need to enable the Super key?" and the paragraph that follows it. Larry.

[lah7]

Thanks Larry. Now to reprint all the books! 😄 📚 🖨️ I mean, changes applied.