Note that external markdown can be put in inst/app/www/ or anywhere inst/.
addResourcePath()
adds a link available at runtime, i.e while your app is served in your browser.
Including an external JS or HTML is to be done like this:
includeMarkdown(
system.file("app/www/plop.md", package = "golemexample")
)
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.