Use "Apptainer" instead of "Singularity"

[arokem]

"Sigularity" => "Singularity"

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 16.66667% with 10 lines in your changes missing coverage. Please review.

Project coverage is 28.54%. Comparing base (0e21c37) to head (4f11bae).

Files with missing lines	Patch %	Lines
qsiprep/utils/bids.py	9.09%	9 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #846      +/-   ##
==========================================
- Coverage   28.57%   28.54%   -0.03%     
==========================================
  Files          68       68              
  Lines       10126    10137      +11     
  Branches     1135     1137       +2     
==========================================
+ Hits         2893     2894       +1     
- Misses       7134     7143       +9     
- Partials       99      100       +1     

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[tsalo]

@arokem should we change Singularity to Apptainer throughout the documentation?

[arokem]

I'll do some more work here to include apptainer and explain that it's sorta the same thing.

[arokem]

I've added "Apptainer" in more places. In some places it seems warranted to have both Singularity and Apptainer, just in case (?)

[tsalo]

LGTM!