ci: add npm package URL to publish to npm environment

Author: rwv

.github/workflows/ci.yml

@@ -193,6 +193,7 @@ jobs:
     if: github.event_name == 'release'
     environment:
       name: npm
+      url: https://www.npmjs.com/package/@lookscanned/how-to
     permissions:
       contents: read
       id-token: write