move Challenges from WAF to Fundamentals

Author: patriciasantaana

src/content/docs/waf/tools/challenge-passage.mdx renamed to src/content/docs/fundamentals/security/cloudflare-challenges/challenge-passage.mdx

@@ -2,7 +2,7 @@
 pcx_content_type: concept
 title: Challenges
 sidebar:
-  order: 3
+  order: 1
 ---
 
 import { Render } from "~/components";