add build_pptx() function and documentation

jhelvy / renderthis

An R package for building xaringan slides into multiple outputs, including html, pdf, png, gif, pptx, and mp4.

https://jhelvy.github.io/renderthis

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Closed brshallo closed 3 years ago

brshallo commented 3 years ago

See jhelvy/xaringanBuilder#4.

Added build_pptx() to "functions.R" and updated README, DESCRIPTION, and "example.R" accordingly.
Also added "inst/example/slides.pptx" (was debating if this was a good idea, but saw davidgohel/officer had many office file types in the examples so figured was OK -- I did not include a link to these though from the README though).

I did not mess with "_pkgdown.yml".

jhelvy commented 3 years ago

Thanks for putting this together! I made a few more edits in 1d2ff35 to add you as a collaborator and improve documentation.