added ogimage

index.html

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     <title>PDSList - A database of Bluesky PDSes </title>
     <link rel="stylesheet" href="styles.css">
     <meta name="description" content="A database of Bluesky PDSes that are 'open' - by madebydanny.uk">
+    <meta type="og:image" content="/media/ogimg.png">
     <link rel="icon" href="/media/database-solid-full.svg" type="image/x-icon"/>
     <link rel="shortcut icon" href="/media/database-solid-full.svg" type="image/x-icon"/>
 </head>