Update the link to the JSON Schema website.

Refs: json-schema-org/website#201

Author: Julian

README.md

@@ -124,7 +124,7 @@ Conformance tests for JSON Schema and its vocabularies may be found
 
 The JSON Schema web site is at http://json-schema.org/
 
-The source for the website is [maintained in a separate repository](https://github.com/json-schema-org/json-schema-org.github.io).
+The source for the website is [maintained in a separate repository](https://github.com/json-schema-org/website).
 
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