CE: Added pages with guidelines for images on Alps

[Madeeks]

As agreed in VCUE, I have updated a set of images with foundational resources (CUDA, MPI, NCCL, NVSHMEM), deriving them from material I use myself, and demonstrated how to run them through the CE on Alps.

The intent of this material is to offer guidelines and suggestions about versions, building, and running of foundational components to use on Alps, without committing to officially supported resources.

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[msimberg]

I'll try to come back to this for a proper review in the next ~week. If someone else wants to look in the mean time, please go ahead.

A question that came up while skimming through the changes is how the performance results in this PR relate to the changes in #262 and whether we should duplicate them?

Another minor note would be to add links to the "Communication libraries" sections, since they contain some useful info about environment variables etc. (sorry if I missed this and you already added them).

Finally, for the spell checker please add the remaining words to .github/actions/spelling/allow.txt (with all caps = exact match, lower case = any capitalization; I think the former is appropriate in this case).

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[Madeeks]

Thanks for the tip about the spelling checker @msimberg.

Regarding references to the "Communication libraries" section, I didn't add anything at this time.
I'm absolutely open to do it, but what I would find most useful is to find an agreement between which settings should we embed directly in hooks (therefore becoming transparent to users, like a bunch of NCCL-related vars in the AWS OFI NCCL hook) and which we leave users to handle directly (e.g. in the EDF).

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