update authors href (#87)

Author: SpatLyu

_pkgdown.yml

@@ -105,9 +105,9 @@ authors:
   Fangmei Liu:
     href: https://github.com/ddl196
   Jianwu Yan:
-    href: https://geog.snnu.edu.cn/info/1061/1288.htm
+    href: https://geog.snnu.edu.cn/info/1301/6681.htm
   Yongze Song:
     href: https://yongzesong.com/
   Wufan Zhao:
-    href: https://wufan-zhao.github.io/
+    href: http://www.ai4dcity.com/