Fix docs link

Author: stephencelis

.github/ISSUE_TEMPLATE/config.yml

@@ -5,7 +5,7 @@ contact_links:
     url: https://github.com/pointfreeco/swift-sharing/discussions
     about: Sharing Q&A, ideas, and more
   - name: Documentation
-    url: https://pointfreeco.github.io/swift-sharing/main/documentation/sharing/
+    url: https://swiftpackageindex.com/pointfreeco/swift-sharing/~/documentation/sharing/
     about: Read Sharing's documentation
   - name: Videos
     url: https://www.pointfree.co/