Fix stupid typo

No wonder they weren’t working!

Author: csswizardry

demo/index.html

@@ -239,7 +239,7 @@
   <meta property="og:title" content="Obs.js – context-aware web performance for everyone">
   <meta property="og:description" content="Obs.js reads device and network signals and allows you to build adaptive user experiences.">
   <meta property="og:url" content="https://csswizardry.com/Obs.js/demo/">
-  <meta property="og:image" content="https://csswizardry.com/assets/og-image.png">
+  <meta property="og:image" content="https://csswizardry.com/Obs.js/demo/assets/og-image.png">
   <meta property="og:image:width" content="1800">
   <meta property="og:image:height" content="942">
   <meta property="og:image:type" content="image/png">
@@ -251,7 +251,7 @@
   <meta name="twitter:domain" content="csswizardry.com">
   <meta name="twitter:title" content="Obs.js – context-aware web performance for everyone">
   <meta name="twitter:description" content="Obs.js reads device and network signals and allows you to build adaptive user experiences.">
-  <meta name="twitter:image" content="https://csswizardry.com/assets/og-image.png">
+  <meta name="twitter:image" content="https://csswizardry.com/Obs.js/demo/assets/og-image.png">
   <meta name="twitter:image:alt" content="Obs.js demo page with video poster frame showing context-aware performance demo">