Put an example in the README using the bundled Rmd files

Something like:

enable_html_annotations()

will inject the following code:

<script src="https://hypothes.is/embed.js" async></script>

Not sure if relevant but this was a project at the last US unconf https://github.com/ropenscilabs/trackmd

In rmd_diffs.R, need to check that the git executable is available to us

Can we replace the system git diff call with a call to git2r::diff?

@raymondben et al 👋 according to our recently created package curation policy this repo should now be transferred to either one of your personal accounts, or the ropensci-archive organization.

If you don't answer within one month, I'll transfer the repository to ropensci-archive, after which you could still email me to transfer the repo to a personal account.

Thank you!

Currently, this somewhat off putting message is received!

Files are identical
NULL
Error in diff_rmd(content$path) : current_file does not exist: 

rmd_diffs to support pdf output

Starting work on supporting rmd diff rendering to word. Custom styles can be used to show differences in rendered doc (nb: this is without using the traditional track-changes option in Word). For example, this rmarkdown snippet:

---
output:
  word_document:
    reference_docx: rmd_reviewer_styles.docx
---

### Example Rmarkdown doc with custom styles for word

This is some text that has the [custom addition style
applied]{custom-style="addtxt"} and this was [some text that was
removed]{custom-style="deltxt"}

Can display as something like

Provided suitable addtxt and deltxt custom styles have been defined in rmd_reviewer_styles.docx

Perhaps this could be added to diff_rmd() as an option with something like

} else if (output_format == "word_document") {
  diffout <- gsub("[-", '{custom-style="addtxt"', diffout, fixed = TRUE)
  diffout <- gsub("-]", "}", diffout, fixed = TRUE)
  diffout <- gsub("{+", '{custom-style="deltxt"', diffout, fixed = TRUE)
  diffout <- gsub("+}", "}", diffout, fixed = TRUE)
}

and then rendered from .md -> docx via pandoc for the raw view (i.e. code chunks will not be run). Or just attempt to use the usual rmarkdown::render to word process for viewing the rendered output