rsync webhook for docs

[johnlees]

Apparently we need to do this:

Hello,

Previously, manually configured webhooks from integrations did not have a secret attached to them. In order to improve security, we have deployed an update so that all new integrations will be created with a secret, and we are deprecating old integrations without a secret. You must migrate your integration by January 31, 2024, when they will stop working without a secret.

We are contacting you because you have at least one integration that does not have a secret set. These integrations are:

https://readthedocs.org/dashboard/pyseer/integrations/24561/

If you aren't using an integration, you can delete it. Otherwise, we recommend clicking on "Resync webhook" to generate a new secret, and then update the secret in your provider's settings as well. You can check our documentation for more information on how to do this.

You can read more information about this in our blog post: https://blog.readthedocs.com/security-update-on-incoming-webhooks/.

I just tried but don't think I have sufficient permissions in the repo