[css] add the entypo font as available ressource (closes #2930356) This provides a standard set of pictograms for use in CubicWeb and cubes. To use a pictogram, the "cubicweb.pictograms.css" must be explicitly loaded (using, e.g. view.add_css(...)).

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raise NotImplementedError("Cannot migrate such an old version. Use intermediate Cubiweb version (try 3.16.x)")