Rename Schedule.md to itinerary.md and update all links

- Rename Schedule.md to itinerary.md for better clarity
- Update all references in README.md navigation section
- Update document navigation table with new filename

Readme.md

@@ -22,7 +22,7 @@ Welcome to the official repository for our monthly 3D printing meetup! This comm
 
 This repository contains all the planning documents, schedules, and challenge information for our meetup:
 
-### 📅 [Schedule](./Schedule.md)
+### [Itinerary](./itinerary.md)
 
 Complete meeting format and timeline for our monthly gatherings. Includes:
 
@@ -113,7 +113,7 @@ We host themed design challenges that encourage creativity and skill development
 
 | Document | Purpose | Key Information |
 |----------|---------|-----------------|
-| [Schedule.md](./Schedule.md) | Meeting structure and timing | 6PM-8PM format, segment details |
+| [itinerary.md](./itinerary.md) | Meeting structure and timing | 6PM-8PM format, segment details |
 | [challenges.md](./challenges.md) | Monthly competitions | Rules, prizes, submission guidelines |
 | [ideas.md](./ideas.md) | Future planning and concepts | Community outreach, format improvements |