Migrate wiki content to repository structure and standardize frontmatter on dev

Upcoming-Challenge.md

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+---
+title: "Upcoming Challenge"
+category: "challenges"
+order: 2
+description: "Preview of upcoming monthly challenges."
+tags:
+  - challenge
+  - upcoming
+---
+[← Back to Home Page](Home)
+
+# Upcoming Challenge: October 2026 (To Be Determined)
+
+## Challenge: [Theme TBD]
+
+*Details for the October 2026 challenge are currently being decided. We will announce the full details at the September 16th meetup.*
+
+### The Focus: [TBD]
+
+*[Focus details to be added]*
+
+### Submission Requirements
+
+* **Physical Model**: Bring your print to the **October** meetup.
+* **The Story**: Be ready to tell the group about your creation.
+
+### Judging & Prize
+
+* **Voting**: The group will vote on their favorite entry.
+* **Prize**: The winner will receive a **free spool of filament**.
+
+### Timeline
+
+* **Challenge Announcement**: September 16th, 2026 (at September meetup)
+* **Show & Tell / Voting**: October 2026 (during October meetup)
+* **Winner Announcement**: October 2026 (end of October meetup)
+
+---
+
+**This challenge will become active in October 2026**