Remove noda repository wikipedia, use GND Explorer for lookups/searches

in external norm data repository GND

Close #28, close #29

src/MDNodaRepositoriesSet.php

@@ -33,7 +33,6 @@ final class MDNodaRepositoriesSet extends MDValueSet {
         'ulan',
         'viaf',
         'wikidata',
-        'Wikipedia',
     ];
 
     public const REPOSITORIES_PLACE = [
@@ -53,7 +52,6 @@ final class MDNodaRepositoriesSet extends MDValueSet {
         'rkd',
         'viaf',
         'wikidata',
-        'Wikipedia',
     ];
 
     public const REPOSITORIES_TAG = [
@@ -76,7 +74,6 @@ final class MDNodaRepositoriesSet extends MDValueSet {
         'rkd',
         'viaf',
         'wikidata',
-        'Wikipedia',
     ];
 
 }