Tutorial cleanup (sandialabs#339)

* run CI on PRs against dev branch

* revamped tutorial 1, including fix for sandialabs#293

* more tutorial cleanup and editorial changes

* more cleanup and incorporated changes in sandialabs#315

* fixed tutorial 2 colormaps

* finishing touches

* reverted a few accidental changes

* fixes as per Jeff's review comments

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Co-authored-by: Ryan Coe <rcoe@sandia.gov>