Update gromacs

[rkronberg]

Proposed changes

Gromacs 2024.0 available on Puhti, Mahti and LUMI. Updated and reorganized apps page slightly (updated benchmark results, content tabs for batch script examples).

https://csc-guide-preview.rahtiapp.fi/origin/gromacs-2024/

Checklist before requesting a review

• [x] I have followed the instructions in the Contributing and Styleguide documents.
• [x] My pull request passes all tests.
• [x] I have included a link to the appropriate preview page (select your branch from the list).