docs: fix broken link

Author: chrischdi

docs/book/src/security/index.md

@@ -3,4 +3,4 @@
 This section provides security guidelines useful to provision clusters which are
 _secure by default_ to follow the [secure defaults guidelines for cloud native apps].
 
-[secure defaults guidelines for cloud native apps]: https://github.com/cncf/tag-security/blob/main/security-whitepaper/secure-defaults-cloud-native-8.md
+[secure defaults guidelines for cloud native apps]: https://github.com/cncf/tag-security/blob/main/community/resources/security-whitepaper/secure-defaults-cloud-native-8.md