Remove "@Label" invalid JSON-LD and unused

This fixes #370

Author: stain

docs/_compatibility/1.0/context.jsonld

@@ -2416,7 +2416,6 @@
           "retrievedOn": "http://purl.org/pav/retrievedOn",
           "retrievedBy": "http://purl.org/pav/retrievedBy",
           "conformsTo": "http://purl.org/dc/terms/conformsTo",
-          "@label": "http://www.w3.org/2000/01/rdf-schema#label",
           "pcdm": "http://pcdm.org/models#",
           "bibo": "http://purl.org/ontology/bibo/",
           "cc": "http://creativecommons.org/ns#",

docs/_compatibility/1.1/context.jsonld

@@ -2638,7 +2638,6 @@
           "retrievedOn": "http://purl.org/pav/retrievedOn",
           "retrievedBy": "http://purl.org/pav/retrievedBy",
           "conformsTo": "http://purl.org/dc/terms/conformsTo",
-          "@label": "http://www.w3.org/2000/01/rdf-schema#label",
           "pcdm": "http://pcdm.org/models#",
           "bibo": "http://purl.org/ontology/bibo/",
           "cc": "http://creativecommons.org/ns#",

docs/_specification/1.0/context.jsonld

@@ -2416,7 +2416,6 @@
           "retrievedOn": "http://purl.org/pav/retrievedOn",
           "retrievedBy": "http://purl.org/pav/retrievedBy",
           "conformsTo": "http://purl.org/dc/terms/conformsTo",
-          "@label": "http://www.w3.org/2000/01/rdf-schema#label",
           "pcdm": "http://pcdm.org/models#",
           "bibo": "http://purl.org/ontology/bibo/",
           "cc": "http://creativecommons.org/ns#",

docs/_specification/1.1/context.jsonld

@@ -2638,7 +2638,6 @@
           "retrievedOn": "http://purl.org/pav/retrievedOn",
           "retrievedBy": "http://purl.org/pav/retrievedBy",
           "conformsTo": "http://purl.org/dc/terms/conformsTo",
-          "@label": "http://www.w3.org/2000/01/rdf-schema#label",
           "pcdm": "http://pcdm.org/models#",
           "bibo": "http://purl.org/ontology/bibo/",
           "cc": "http://creativecommons.org/ns#",