Cerebrovascular reactivity mapping tutorial

[tsalo]

I'll outline the steps for such a tutorial here:

1. Load semi-preprocessed multi-echo fMRI data, physio data, and event information from the EuskaliBUR dataset (dependent on Add minimally-preprocessed EuskalIBUR dataset to datasets module tedana#778).
2. Describe the CVR formulae and process.
3. Run the analysis on the loaded data.
4. Show the resulting map(s).

[tsalo]

Some great works by @smoia with some potential overlap:

• https://smoia.github.io/cvr-rel-var/
• https://smoia.github.io/cvr-meica-motion-removal/
• https://smoia.github.io/cvr-compare-bh-rs/

EDIT: Our goal being to cite these works and ensure our tutorial is more basic, without too much overlap with @smoia's novel analyses.