Update Hacktoberfest 2025 event details

Signed-off-by: Lee Calcote <lee.calcote@layer5.io>

Author: leecalcote

src/collections/events/2025/hacktoberfest-2025/index.mdx

@@ -1,12 +1,12 @@
 ---
 title: "Hacktoberfest Prep 2025: Design with Meshery"
 description: "Prepare for Hacktoberfest with Layer5 MeshMates and Maintainers. Join seasoned open source maintainers, hack through easy issues, and grow your skills. Discover Newcomers resources and explore the Layer5 Community Handbook."
-thumbnail: 
-darkthumbnail: 
+thumbnail: ./layer5-hacktoberfest11-badge-large.png
+darkthumbnail: ./layer5-hacktoberfest11-badge-large.png
 date: 2025-00-03
-eurl: 
+eurl: https://hacktoberfest.com
 type: Event
-speakers: []
+speakers: [Ritesh Karankal]
 published: false
 upcoming: true
 register: true