closes #286 commit messaging, new r-cmd vignette

[bms63]

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[bms63]

HI all,

Some minor updates on commit messaging on the vignettes. I also split on the R CMD section of the Pull Request Vignette into its own vignette. It was buried at the end there.

Did a little other sprucing throughout to bring up to alignment with our current practices.

[github-actions]

Package	Line Rate	Health
admiraldev	97%	✔
Summary	97% (1138 / 1169)	✔

[zdz2101]

Do we need to add a NEWS snippet at least to indicate we created a new section?

[bms63]

Do we need to add a NEWS snippet at least to indicate we created a new section?

Sure - I love the news!