Adding fsps demo; adding fsps set-up to smoke test

[OliviaLynn]

Problem & Solution Description (including issue #)

Moving in fsps notebook from Eric's branch in fsps

Also adding a step in the smoke test workflow to get fsps set up (required; see this failed run without the set-up step)

Final piece of #48

Code Quality

• My code follows the code style of this project
• Any breaking changes, described above, are accompanied by backwards compatibility and deprecation warnings

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (26bdfb7) 100.00% compared to head (d31b42f) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #118   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines            1         1           
=========================================
  Hits             1         1           

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[eacharles]

Ok, smoke test ran successfully on this branch. Looks good.