Some fixes and updates to run-colab guide:

- Add "Open in Colab" button.
- Update installation instructions for mxfp4 kernels after latest (and
  final) changes in transformers main.
- Fix reasoning_effort.
- Fix links to HF blog post.

Co-authored-by: vb <[email protected]>
Co-authored-by: lewtun <[email protected]>
Co-authored-by: Alvaro Bartolome <[email protected]>
Co-authored-by: sergiopaniego <[email protected]>

Author: 5 people