fix: proper URLs in https://updates.jenkins.io/index.html#907

lemeurherve merged 1 commit intojenkins-infra:masterjenkins-infra/update-center2:masterfrom

lemeurherve:helpdesk4882-absolute-links-in-header-and-footerlemeurherve/update-center2:helpdesk4882-absolute-links-in-header-and-footerCopy head branch name to clipboard