remove doc-pr-delete actions
Our workflow executions for  .github/workflows/doc-pr-delete-trigger.yml have been failing for 2 months https://github.com/huggingface/datasets-server/actions/workflows/doc-pr-delete-trigger.yml due to non-existing workflow in doc-builder project.
As in other projects, removing related files https://github.com/huggingface/peft/pull/1213 https://github.com/huggingface/diffusers/pull/6373 https://github.com/huggingface/transformers/pull/27852

remove doc-pr-delete actions: Our workflow executions for  .github/workflows/doc-pr-delete-trigger.yml have been failing for 2 months https://github.com/huggingface/datasets-server/actions/workflows/doc-pr-delete-trigger.yml due to non-existing workflow in doc-builder project.
As in other projects, removing related files https://github.com/huggingface/peft/pull/1213 https://github.com/huggingface/diffusers/pull/6373 https://github.com/huggingface/transformers/pull/27852
