Improve documentation for running QSIPrep with TemplateFlow on non-internet nodes

[pierre-nedelec]

Changes proposed in this pull request

This pull request improves the QSIPrep documentation by adding detailed guidance for configuring TEMPLATEFLOW_HOME when running QSIPrep on nodes without internet access. Specifically:

• Clarifies the behavior of QSIPrep when using --containall, emphasizing the need to explicitly set and bind TEMPLATEFLOW_HOME.
• Provides step-by-step instructions for ensuring required templates are pre-fetched and made available in offline environments.
• Includes usage examples for both internet-enabled and non-internet nodes to streamline the workflow.
• Links to relevant resources, including the fMRIPrep FAQ and a Neurostars thread discussing similar issues.

These changes address user confusion regarding offline usage of QSIPrep with TemplateFlow and improve the documentation for both first-time and advanced users.

Documentation that should be reviewed

The primary changes are located in the section detailing Apptainer usage docs/installation.rst.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 45.80%. Comparing base (fa4dbe0) to head (b76b0ce).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #907      +/-   ##
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+ Coverage   44.23%   45.80%   +1.57%     
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  Files          66       65       -1     
  Lines        9839     9722     -117     
  Branches     1097     1063      -34     
==========================================
+ Hits         4352     4453     +101     
+ Misses       5263     5041     -222     
- Partials      224      228       +4     

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[mattcieslak]

Thank you @pierre-nedelec! I added one suggestion