Publication links are 403

Links in this docs page: https://grr-doc.readthedocs.io/en/latest/publications.html return 403

Eg https://storage.googleapis.com/docs.grr-response.com/scalable_datastore.pdf

Results in

```

AccessDenied
Access denied.
Anonymous caller does not have storage.objects.get access to the Google Cloud Storage object. Permission 'storage.objects.get' denied on resource '//storage.googleapis.com/projects/_/buckets/docs.grr-response.com/objects/scalable_datastore.pdf' (or it may not exist). Remediate access with this Troubleshooter URL or share it with your administrator - https://console.cloud.google.com/iam-admin/troubleshooter/summary;errorId=CiQwMTlmYTA2Ny1kNDM0LTc2YTQtOGNkZi0wODc0MjMzNWE4MGISR3Byb2plY3RzL18vYnVja2V0cy9kb2NzLmdyci1yZXNwb25zZS5jb20vb2JqZWN0cy9zY2FsYWJsZV9kYXRhc3RvcmUucGRm .

```

Start with the publications page at https://grr-doc.readthedocs.io/en/latest/publications.html and verify the listed publication links, including scalable_datastore.pdf. Check which links return 403 and determine accessible targets for them. Done means the publication links on the page can be opened without access errors.

Written by the indexing model from the issue text.