Updated docs and added doc build test to workflow

[REIL-UConn]

Description

Added doctests and doc build tests into the CI workflow.
Move the example Jupyter notebooks to docs/source/notebooks. Added link from prior location.

Related Issues

None

How Has This Been Tested?

• Local pytest run
• CI passes
• Manual checks (describe if needed)

Checklist

• My code follows project style guidelines: nox -s pre-commit
• I have added tests that prove my fix is effective or my feature works: nox -s unit
• I have updated documentation if needed: nox -s docs
• I have linked related issues

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