[draft] Add documentation on composing error mitigation techniques

[nathanshammah]

Add a section to the user guide on composing error mitigation techniques.

[github-actions[bot]]

:point_left: Launch a binder notebook on branch nathanshammah/mitiq/compose

[codecov[bot]]

Codecov Report

Merging #1043 (0d14c4e) into master (3e5bdb7) will not change coverage. The diff coverage is n/a.

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  Coverage   97.97%   97.97%           
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  Files          54       54           
  Lines        2514     2514           
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  Hits         2463     2463           
  Misses         51       51           

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[crazy4pi314]

@nathanshammah are there any blockers/issues on this, or did it get covered somewhere else in the docs refactor?

[github-actions[bot]]

This pull request had no activity for 2 months, and will be closed in one week unless there is new activity. Cheers!

[natestemen]

@nathanshammah is this still something we'd like to work on?

[nathanshammah]

Closing this for now.