[8.0] remove nightly (was for py2!) and updated info

[fstagni]

No description provided.

[fstagni]

...just merging, I hope it is OK.

[DIRACGridBot]

Sweep summary

Sweep ran in https://github.com/DIRACGrid/DIRAC/actions/runs/10195444763

Failed:

• integration
  cherry-pick 28570bc into integration failed
  check merge conflicts on a local copy of this repository

  git fetch upstream
  git checkout upstream/integration -b cherry-pick-2-28570bc9c-integration
  git cherry-pick -x -m 1 28570bc9c
  # Fix the conflicts
  git cherry-pick --continue
  git commit --amend -m 'sweep: #7743 remove nightly (was for py2!) and updated info ' --author='Federico Stagni <[email protected]>'
  git push -u origin cherry-pick-2-28570bc9c-integration
  
  # If you have the GitHub CLI installed the PR can be made with
  gh pr create \
       --label 'sweep:from rel-v8r0' \
       --base integration \
       --repo DIRACGrid/DIRAC \
       --title '[sweep:integration] remove nightly (was for py2!) and updated info ' \
       --body 'Sweep #7743 `remove nightly (was for py2!) and updated info ` to `integration`.
  
  Adding original author @fstagni as watcher.
  
  
  Closes #7744'