fix broken links

Author: l00mi

index.html

@@ -45,12 +45,12 @@
       }, {
         "@id": "#libraries",
         "breadcrumb": [{
-          "@id": "/data-model/",
+          "@id": "https://github.com/rdfjs-base/data-model",
           "name": "@rdfjs/data-model",
           "description": "Basic implementation of RDFJS Data Model.",
           "implements": [ "DataFactory" ]
         }, {
-          "@id": "/dataset/",
+          "@id": "https://github.com/rdfjs-base/dataset",
           "name": "@rdfjs/dataset",
           "description": "Basic implementation of RDFJS Dataset.",
           "implements": [ "Dataset" ]