[GEOS] Define an archiving mechanism and baselining

[FlorianDeconinck]

Previous benchmark have been hand made and stored - leading to some forgetfulness.

We need to be able to store them properly and draft a website/report that is very detailed and serve as base of truth. Nebulae wiki is one version controlled storage, for example.

We should also archive the results as long as they are compressed to a manageable size (.json of dycore timings, log of GEOS, data in general)

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• Document workflow (and do required setup) for benchmark data/result save