* Fix has_file in offline mode
* harmonize env variable for offline mode
* Switch to HF_HUB_OFFLINE
* fix test
* revert test_offline to test TRANSFORMERS_OFFLINE
* Add new offline test
* merge conflicts
* docs
* Add missing entries to the language selector
* Add links to the Colab and AWS Studio notebooks for ONNX
* Use anchor links in CONTRIBUTING.md
* Fix broken hyperlinks due to spaces
* Fix links to OpenAI research articles
* Remove confusing footnote symbols from author names, as they are also considered invalid markup