Add links to Setup

docs/example-contracts/custom-types.mdx

@@ -14,6 +14,8 @@ invocations.
 First go through the [Setup] process to get your development environment
 configured, then clone the examples repository:
 
+[Setup]: ../getting-started/setup.mdx
+
 ```
 git clone https://github.com/stellar/soroban-examples
 ```

docs/example-contracts/hello-world.mdx

@@ -13,6 +13,8 @@ single function that takes one input and returns it as an output.
 First go through the [Setup] process to get your development environment
 configured, then clone the examples repository:
 
+[Setup]: ../getting-started/setup.mdx
+
 ```
 git clone https://github.com/stellar/soroban-examples
 ```

docs/example-contracts/increment.mdx

@@ -13,6 +13,8 @@ single function that increments an internal counter and returns the value.
 First go through the [Setup] process to get your development environment
 configured, then clone the examples repository:
 
+[Setup]: ../getting-started/setup.mdx
+
 ```
 git clone https://github.com/stellar/soroban-examples
 ```