Update index.md (MystenLabs#1335)

Make all links relative to meet Dev Portal index file requirements

doc/src/build/programming-with-objects/index.md

@@ -2,30 +2,30 @@
 title: Programming Objects Tutorial Series
 ---
 
-Sui is a blockchain centered on [objects](../objects.md). Once you start programming non-trivial [smart contracts](../move.md) on Sui, you will start dealing with Sui objects in the code. Sui includes a rich, comprehensive library and testing framework to allow you interact with objects in a safe and yet flexible way.
+Sui is a blockchain centered on [objects](../../build/objects.md). Once you start programming non-trivial [smart contracts](../../build/move.md) on Sui, you will start dealing with Sui objects in the code. Sui includes a rich, comprehensive library and testing framework to allow you interact with objects in a safe and yet flexible way.
 
 In this tutorial series, we will walk through all the powerful ways to interact with objects in [Sui Move](../../learn/sui-move-diffs.md). At the end, we will also explore the designs of a few (close-to-)real-world examples to demonstrate the tradeoffs of using different object types and ownership relationships.
 
 Prerequisite Readings:
 - [Learn about Sui](../../learn/about-sui.md)
-- [Smart Contracts with Move](../move.md)
-- [Sui Objects](../objects.md)
+- [Smart Contracts with Move](../../build/move.md)
+- [Sui Objects](../../build/objects.md)
 
 Index:
-- [Chapter 1: Object Basics](./ch1-object-basics.md)
+- [Chapter 1: Object Basics](../../build/programming-with-objects/ch1-object-basics.md)
   - Defining Move object types, creating objects, transferring objects.
-- [Chapter 2: Using Objects](./ch2-using-objects.md)
+- [Chapter 2: Using Objects](../../build/programming-with-objects/ch2-using-objects.md)
   - Passing Move objects as arguments, mutating objects, deleting objects.
-- [Chapter 3: Immutable Objects](./ch3-immutable-objects.md)
+- [Chapter 3: Immutable Objects](../../build/programming-with-objects/ch3-immutable-objects.md)
   - Freezing an object, using immutable objects.
-- [Chapter 4: Object Wrapping](./ch4-object-wrapping.md)
+- [Chapter 4: Object Wrapping](../../build/programming-with-objects/ch4-object-wrapping.md)
   - Wrapping objects in another object.
-- [Chapter 5: Child Objects](./ch5-child-objects.md)
+- [Chapter 5: Child Objects](../../build/programming-with-objects/ch5-child-objects.md)
   - Enabling objects to own other objects, transferring objects to objects, adding child objects, removing child objects.
-- [Chapter 6: Collection and Bag](./ch6-collection-and-bag.md)
+- [Chapter 6: Collection and Bag](../../build/programming-with-objects/ch6-collection-and-bag.md)
   - Using Collection and Bag library.
-- [Chapter 7: Shared Objects](./ch7-shared-objects.md)
+- [Chapter 7: Shared Objects](../../build/programming-with-objects/ch7-shared-objects.md)
   - Creating shared objects, using share objects.
-- [Chapter 8: Case Study (TicTacToe)](./ch8-case-study-tictactoe.md)
+- [Chapter 8: Case Study (TicTacToe)](../../build/programming-with-objects/ch8-case-study-tictactoe.md)
   - Developing a real game with objects, trade-offs between shared objects and single-writer objects.
 - Chapter 9: Case Study (TBD)