Use a single image with the reference image and the QR code

README.md

 > - Avoid low-quality cameras (cameras of common smartphones are OK).
 >
 
-| Cartoon |   |
-| - | - |
-| [![Reference Image](docs/demo/my-reference-image.webp)](docs/demo/my-reference-image.webp) | [![QR code](docs/demo/qr-code.png)](https://alemart.github.io/martins-js/demo/) |
-
+[![WebAR demo](docs/demo/reference-image-with-qr-code.webp)](https://alemart.github.io/martins-js/demo/)
 
 ## Why use MARTINS.js?
 

docs/demo/instructions.md

     - The physical environment should be properly illuminated.
     - Avoid low-quality cameras (cameras of common smartphones are OK).
 
-## Scan the QR code
-
-[![QR code](qr-code.png){ width=320 }](index.md){ ._blank }
-
-## Scan the cartoon
-
-[![Reference Image](my-reference-image.webp){ width=600 }](my-reference-image.webp){ ._blank }
+[![WebAR demo](reference-image-with-qr-code.webp)](./index.md){ ._blank }
 
 ## Wanna see more?