Group VO tables to json

Convert VO (group) data to json, in order to have it machine readable. Build documentation table from there.

• 👉 Review
  • main page
  • table
  • json

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• manual-convert "Helmholtz" VO infos to json 👉 there
• add full group claim for helmholtz.de, nfdis etc
• filter out group claims for the tables
• add converson-to-markdown in pipeline 👉 there

later

• add more metadata: nubes capability
• add NFDI groups.