Replace deprecated wiki link

Author: taoky

README.md

@@ -196,7 +196,7 @@ Currently `*.json` is ignored in `.gitignore` (not ignored in `/static`). If one
 
 ### Contributing
 
-Other contributing guidelines are maintained in <https://github.com/mirrorz-org/org/wiki>
+Other contributing guidelines are maintained in <https://github.com/mirrorz-org/org/>
 
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