create category challenges

Author: woodthom2

content/en/blog/design-challenge.md

@@ -1,7 +1,7 @@
 ---
 title: "Help Design Harmony - UX Design Challenge"
 categories: 
-  - "development"
+  - "challenges"
 image: "/images/Design_Challenge_New_Date.png" 
 date: 2025-01-13
 url: "/design-challenge/"

content/en/blog/doxa-parsing.md

@@ -1,7 +1,7 @@
 ---
 title: "Improve Harmony's PDF parsing on DOXA AI"
 categories: 
-  - "ai-in-research"
+  - "challenges"
 image: "/images/parsing-banner.png"
 date: 2024-12-20
 url: "/doxa-parsing/"