Remove outdated keys after DAG remove

[andrea-pasquale]

Removing priority, next and main from some runcards and documentation.

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 97.23%. Comparing base (c171ad9) to head (91c7236).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #763   +/-   ##
=======================================
  Coverage   97.23%   97.23%           
=======================================
  Files         102      102           
  Lines        7297     7297           
=======================================
  Hits         7095     7095           
  Misses        202      202           

Flag	Coverage Δ
unittests	97.23% <ø> (ø)

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see 2 files with indirect coverage changes