Check OG and TC metadata

[andybega]

Make sure the website does open graph and twitter cards metadata correctly.

[andybega]

Right now these are manually added for each file using a _[page]_header.html include, and corresponding metadata in each file. Not very elegant, but it works.

I wonder if it is possible to add this info as YAML metadata and have pandoc add it to the output HTML?

[andybega]

Some links for trying to do this via YAML metadata:

• RMarkdown custom templates https://bookdown.org/yihui/rmarkdown/html-document.html
• rmarkdown::render(): https://github.com/rstudio/rmarkdown/blob/master/R/render.R; this goes to pandoc, I think
• bookdown has YAML tags for SM meta tags, how is it done there? https://bookdown.org/yihui/bookdown/html.html
  • here's the default template, looks easy enough: https://github.com/rstudio/bookdown/blob/master/inst/templates/default.html
• pandoc html template https://github.com/jgm/pandoc-templates/blob/master/default.html5
• rmarkdown site generator (what I'm using): https://bookdown.org/yihui/rmarkdown/rmarkdown-site.html