This change extracts org link registration into a dedicated org-pdftools-setup-link function and updates the README to use it via an org-load hook instead of requiring users to manually call org-link-set-parameters in their config. Making the setup function autoloadable reduces configuration boilerplate and makes package initialization more reliable, especially for MELPA/use-package users. In practice, enabling org-pdftools is now a one-line hook and link support comes up more cleanly.