Blogpost Ibergrid

draft for Ibergrid post

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@wetzel-desy @tfoerst1 please add a short paragraph concerning your contribution to Ibergrid and link to available resources like book of abstract or similar

related issue: are there plans to publish the prelim. versions elsewhere instead of notes? They could be uploaded on Zenodo, which would result in DOIs and they could be included in the HIFIS collection we are trying to build there. And it would look better, "more official" in the HIFIS publications list.