Update link to pcui-graph

docs/pages/7-pcui-graph.markdown

@@ -9,4 +9,4 @@ nav_order: 7
 
 PCUI Graph is a graph visualization framework designed to help you build applications that can create and view node-based graphs in the browser. It was built as an extension of the PCUI library but now lives in its own repository.
 
-[Click here](http://www.github.com/playcanvas/pcui-graph) to view the github page for PCUI Graph, which includes a complete user guide and full API documentation of the library.
+[Click here](https://playcanvas.github.io/pcui-graph) to learn more.