Prevent parameters classes to appear in the index

[alecandido]

Most of them were already isolated, but for the few which were not the index was completely useless.

Checklist:

• Reviewers confirm new code works as expected.
• Tests are passing.
• Coverage does not decrease.
• Documentation is updated.
• Compatibility with Qibo modules (Please edit this section if the current pull request is not compatible with the following branches).
  • Qibo: master
  • Qibolab: main
  • Qibolab_platforms_qrc: main

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.54%. Comparing base (6789ac8) to head (39cd463).
Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1009      +/-   ##
==========================================
+ Coverage   97.52%   97.54%   +0.02%     
==========================================
  Files         123      123              
  Lines        9713     9713              
==========================================
+ Hits         9473     9475       +2     
+ Misses        240      238       -2     

Flag	Coverage Δ
unittests	97.54% <ø> (+0.02%)	⬆️

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see 1 file with indirect coverage changes