[Feature Request]: User-defined templates for reports

[chlebowa]

Feature description

Rmarkdown allows using template documents to style docx and pptx files.

https://bookdown.org/yihui/rmarkdown/word-document.html
https://bookdown.org/yihui/rmarkdown-cookbook/word-template.html
https://bookdown.org/yihui/rmarkdown/powerpoint-presentation.html#ppt-templates

Would it be possible for teal.reporter to

1. accept the user's template file?
2. allow the user to choose a file from a selection provided by the app developer and stored on the deployment server?

Both could work by presenting a fileInput conditional on the document type being "word" or "powerpoint"

This would require (among other things) allowing reference_docx in rmd_yaml_args in reporter_previewer_srv and download_report_button_srv.

Possibly related to #15

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[donyunardi]

The concept is plausible.
@kumamiao what do you think?

[kumamiao]

Sorry just saw this, I like the idea and think it would improve user experience.