refactor: remove code organization section from exercises and update next steps

Author: kentcdodds

exercises/05.utility-types/FINISHED.mdx

@@ -19,4 +19,4 @@ type UserUpdate = Partial<Pick<User, 'name' | 'email'>>
 
 This pattern is common in APIs where you want to update specific fields.
 
-Next up: Code organization patterns!
+Next up: Mapped types!

exercises/FINISHED.mdx

@@ -10,7 +10,6 @@ You've mastered production-ready TypeScript patterns:
 - **Type operators** like `keyof`, `typeof`, and index access
 - **Mapped types** for creating type transformations
 - **Conditional types** for type-level logic
-- **Code organization** patterns that scale
 
 📝 Reflect on what you learned:
 

exercises/README.mdx

@@ -10,9 +10,8 @@ In this workshop, you'll master:
 3. **Modules** - Organizing code with ES modules and TypeScript
 4. **Type Operators** - Using `keyof`, `typeof`, and index access types
 5. **Utility Types** - Leveraging TypeScript's built-in type helpers
-6. **Code Organization** - Structuring large TypeScript projects
-7. **Mapped Types** - Creating types from other types
-8. **Conditional Types** - Types that depend on conditions
+6. **Mapped Types** - Creating types from other types
+7. **Conditional Types** - Types that depend on conditions
 
 <callout-info>
 	This workshop focuses on real-world scenarios. You'll work with API calls,
@@ -28,6 +27,5 @@ By the end of this workshop, you'll be able to:
 - Use type operators to derive types from values
 - Use utility types to transform and manipulate types
 - Create custom mapped and conditional types
-- Structure large TypeScript projects for maintainability
 
 Let's build TypeScript code that survives the real world! 🚀