Update figure-generating notebook

[tsalo]

Closes none. I figure that we've made a bunch of changes to the codebase that should be reflected in the documentation (e.g., the adaptive mask).

Changes proposed in this pull request:

• Update the walkthrough notebook to follow the current output filename convention.
• Update the denoising approach page's figures.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.91%. Comparing base (0f6cbe1) to head (5f6354b).

Additional details and impacted files

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##             main    #1074   +/-   ##
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  Coverage   89.91%   89.91%           
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  Files          26       26           
  Lines        3621     3621           
  Branches      629      629           
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  Hits         3256     3256           
  Misses        214      214           
  Partials      151      151           

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[tsalo]

I found a voxel that actually has a more interesting signal development across echoes than the old one, which was really just the checkerboard signal across all of the echoes.

[tsalo]

I thought this might be interesting to show the adaptive mask.

[eurunuela]

LGTM!