Update demo link to use relative path for scanning common 2D codes

Author: a362758199

index.html

@@ -1383,7 +1383,7 @@ <h3>
             <span data-balloon-length="large" data-balloon-pos="down" aria-label="Demo focused on decoding common 2D barcode formats."
               ><a
                 class="button title demo-link"
-                href="https://github.com/Dynamsoft/barcode-reader-javascript-samples/tree/main/scenarios/scan-common-2D-codes/index.html"
+                href="scenarios/scan-common-2D-codes/index.html"
                 title="View live demo"
                 >Scan Common 2D Codes</a
               ><a