Add Emacs backup files to .gitignore.
Add Emacs backup files to .gitignore.

dacut/hpc-lab-maker,dacut/aws-lab-cafe,dacut/hpc-lab-maker,dacut/hpc-lab-maker,dacut/aws-lab-cafe,dacut/hpc-lab-maker,dacut/hpc-lab-maker,dacut/hpc-lab-maker,dacut/aws-lab-cafe,dacut/aws-lab-cafe,dacut/aws-lab-cafe,dacut/aws-lab-cafe