Put Transformers on Conda (#8918)
* conda
* Guide
* correct tag
* Update README.md
Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>
* Update docs/source/installation.md
Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>
* Sylvain's comments
Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>
