BUG: Fix introduction episode non-solution notebook

[jhlegarreta]

Fix introduction episode non-solution notebook: use the correct dataset
and subject for the analyses.

Fixes:

ValueError: BIDS root does not exist: /home/runner/work/SDC-BIDS-dMRI/SDC-BIDS-dMRI/data/ds000030

raised in
https://github.com/carpentries-incubator/SDC-BIDS-dMRI/runs/3025093598?check_suite_focus=true#step:7:44

Synchronize the markdown episode contents and the Jupyter notebooks
(both the non-solution and solution).

Take advantage of the commit to:

• Fix the static image relative path.
• Fix the dataset tree: change the duplicate fmap folder for the
  missing func folder.
• Add the bids initial dot extension config statement to avoid the
  related warning being displayed.
• Remove the dipy and fury installation steps: both tools are
  assumed to have been installed during setup.
• Use the same DWI volume for to be displayed.
• Fix the output of the bvecs.
• Removed the unexplained b0 volume slicing block.
• Add exercise to notebooks.
• Fix the suffix syntax in exercise.
• Remove the second exercise: it is already explained/done at the
  beginning of the episode.
• Fix typos.
• Remove outputs from non-solution notebook.

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[jhlegarreta]

Partially fixes #14 (addresses the third task).

I ignore if the osf copy of the data is a faithful mirror of the openneuro data; i.e. if the treee would look as it is written. I sticked to what I saw in openneuro. Please check and amend the commit as necessary.

I'd say that I'd be better to merge this prior to #165, since the latter's changes can more easily be applied if the rebasing derives in hard-to-solve conflicts.

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[kaitj]

Looks fine to me, I don't recall if the subject is still included in ds000221, but the structure would still be the same (just different subject id). This seems like a good intermediate step - if i recall @josephmje was working on a revamped intro (or was that already merged in)?

[jhlegarreta]

Further improvements can come in separate PRs. This would be a step towards making the episode and its notebooks consistent, and hopefully have the tests passing, since the non-solution notebook is non-functional as it is now.