Lots of changes

[maleadt]

Update of the juliagpu.org home page, both adding content, reorganizing things, and updating dependencies:

• Add showcases
• Add more back-ends, group in submenu
• Switch to Bootstrap 5
• Switch to CDN-provided resources

I feel like the newly-added showcases section is a bit boring (code-heavy) though, so I'd appreciate if people could suggest some content for things to be featured, e.g., a link to a paper, an impressive performance chart or nice visual, some impressive characteristics compared to software counterparts, etc. @glwagner @luraess @omlins @vchuravy @kshyatt @amontoison @jpsamaroo @DhairyaLGandhi @ChrisRackauckas @ViralBShah

[github-actions]

Once the build has completed, you can preview your PR at this URL: https://juliagpu.org/previews/PR52/ in a couple of minutes.

[glwagner]

Here's a figure generated by @simone-silvestri's work on Oceananigans in global configurations:

this was published as part of a Gordon Bell effort in 2023: https://www.navidconstantinou.com/publications/oceananigans-scalings.pdf

That work was eventually published as a long-form paper in the Journal for Advances in Modeling Earth Systems: https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2024MS004465 (it was also highlighted in EOS, which is an honor, in a commentary written by prominent scientists at modeling centers in Europe and the US: https://eos.org/editor-highlights/a-leap-toward-next-generation-ocean-models).

There are some nice scaling plots in the JAMES paper:

and others. Also visualizations:

We can generate additional figures easily, and we are overdue for an update on the scaling results, not least since some recent significant performance gains.

[ChrisRackauckas]

[maleadt]

Let's merge this. If anybody else wants to add a showcase, open an issue with some details (preferably some nice images/plots).