update demo to include relative downloadUrl

Author: sserrata

demo/docusaurus.config.js

@@ -237,8 +237,7 @@ const config = {
               categoryLinkSource: "tag",
             },
             template: "api.mustache", // Customize API MDX with mustache template
-            downloadUrl:
-              "https://raw.githubusercontent.com/PaloAltoNetworks/docusaurus-openapi-docs/main/demo/examples/petstore.yaml",
+            downloadUrl: "/petstore.yaml",
             hideSendButton: false,
             showSchemas: true,
             disableCompression: true,