[doc] Explain how to run "big" model

[Cervangirard]

Issues to validate to close :

• [ ] issue #96

Checklist:

• [ ] Does the package check works locally?
• [ ] Does the CI pass?
• [ ] Are the added / fixed features documented, tested?
• [ ] Are the added features / solved problems briefly presented in the PR message?
• [ ] Are the changes related to tickets / issues that I have listed in the commits and in the PR itself?
• [ ] Are the tickets in "review" mode in the Project Tracking Board?
• [ ] Does each ticket, if it is to be closed after acceptance of the PR, contain a comment that tells how to validate it?

[codecov[bot]]

Codecov Report

Merging #103 (2b4f5ca) into main (c6554d1) will decrease coverage by 0.15%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #103      +/-   ##
==========================================
- Coverage   77.95%   77.80%   -0.15%     
==========================================
  Files           7        7              
  Lines         703      703              
==========================================
- Hits          548      547       -1     
- Misses        155      156       +1     

see 1 file with indirect coverage changes

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