Fixed notebooks links

[Framba-Luca]

No description provided.

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.02 ⚠️

Comparison is base (6492a4f) 85.05% compared to head (802897d) 85.04%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #458      +/-   ##
==========================================
- Coverage   85.05%   85.04%   -0.02%     
==========================================
  Files         198      198              
  Lines       25722    25722              
==========================================
- Hits        21878    21875       -3     
- Misses       3844     3847       +3     

Impacted Files	Coverage Δ
unified_planning/model/problem.py	88.72% <100.00%> (ø)

... and 2 files with indirect coverage changes

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