docs(kitchen-sink): add step to run build at the root of the app to getting started

Author: zeinaaabbb

examples/kitchen-sink/README.md

@@ -4,13 +4,19 @@ This example demonstrates all the pieces of Page Kit working together. It is int
 
 ### Running the app
 
+First run build at the root of the app to pick up the changes and the compiling of shared packages
+
+```bash
+npm run build
+```
+
 To start the example app enter this directory:
 
 ```bash
 cd examples/kitchen-sink
 ```
 
-To build the app:
+To build the example app:
 
 ```bash
 npm run build