I have never used a Pinboard app so I have no idea how they work. I did a search for Pinboard App (always a good place to start): https://duckduckgo.com/?t=ffab&q=Pin...=v357-1&ia=web

Depending on the app it might be possible to publish the Pinboard app separately and link to it from your website. If the Pinboard has an option you can link back to your website from the app.