Add blog link

Author: willeastcott

typedoc.json

@@ -18,6 +18,7 @@
     "name": "PlayCanvas API Reference",
     "navigationLinks": {
         "Developer Site": "https://developer.playcanvas.com/",
+        "Blog": "https://blog.playcanvas.com/",
         "Discord": "https://discord.gg/RSaMRzg",
         "Forum": "https://forum.playcanvas.com/",
         "GitHub": "https://github.com/playcanvas"