test image in header html

quarto_docs/_quarto.yml

@@ -5,7 +5,7 @@ website:
   title: "STRIDE-Lab"
   site-url: "https://stride-lab.pages.uzh.ch/website/"
   favicon: images/fav_icon_stride.png
-  image: "https://en.wikipedia.org/wiki/PNG#/media/File:PNG_transparency_demonstration_1.png"
+  image: images/preview.png
   twitter-card:
     image: images/stride_lab_logo.png
   open-graph: true

quarto_docs/header.html

 <meta property="og:title" content="STRIDE-Lab Website" />
 <meta property="og:type" content="website" />
 <meta property="og:url" content="https://stride-lab.pages.uzh.ch/website/" />
-<meta property="og:image" content="images/preview.png" />
+<meta property="og:image" content="https://en.wikipedia.org/wiki/PNG#/media/File:PNG_transparency_demonstration_1.png" />
 <meta property="og:description" content="A brief description of your document" />
\ No newline at end of file