fix image preview shareable links

Author: ritamtbsilva

assets/logos/og-image.png

@@ -16,7 +16,13 @@
         content="Disease Transcriptomics Lab - Computational biology research on human disease at NOVA Medical School, Lisbon." />
   <meta property="og:title"        content="Disease Transcriptomics Lab · NMorais Lab" />
   <meta property="og:description"  content="Decoding transcriptomes to understand disease. Computational biology research at NOVA Medical School, Lisbon." />
-  <meta property="og:image"        content="assets/logos/logo-full-dark.png" />
+  <meta property="og:url"          content="https://diseasetranscriptomicslab.github.io/" />
+  <meta property="og:type"         content="website" />
+  <meta property="og:image"        content="https://diseasetranscriptomicslab.github.io/assets/logos/og-image.png" />
+  <meta property="og:image:width"  content="1200" />
+  <meta property="og:image:height" content="630" />
+  <meta name="twitter:card"        content="summary_large_image" />
+  <meta name="twitter:image"       content="https://diseasetranscriptomicslab.github.io/assets/logos/og-image.png" />
   <title>Disease Transcriptomics Lab</title>
 
   <!-- Favicon - swapped dynamically by JS below for reliable cross-browser support -->