Add declarative link capturing

See https://github.com/WICG/sw-launch/blob/master/declarative_link_capturing.md#user-content-proposal:~:text=new_client,-%E2%80%9D%20%E2%80%94 for context.

public/manifest.json

@@ -25,5 +25,6 @@
         "application/vnd.excalidraw+json": [".excalidraw"]
       }
     }
-  ]
+  ],
+  "capture_links": "new_client"
 }