feat: added opengraph tags to homepage

server.ts

@@ -79,8 +79,12 @@ async function createProductionRouter() {
         const fullUrl = `${req.protocol}://${req.get('host')}${req.originalUrl}`
         const metaTagsHtml =
             '' +
-            (metadata.title ? `<meta property="og:title" content="${metadata.title}" />\n` : '') +
-            (metadata.description ? `<meta property="og:description" content="${metadata.description}" />\n` : '') +
+            (metadata.title ? `<meta property="og:title" content="${metadata.title ?? 'PHC | Problemi'}" />\n` : '') +
+            (metadata.description
+                ? `<meta property="og:description" content="${
+                      metadata.description ?? 'Bacheca di problemi di matematica creato dal PHC'
+                  }" />\n`
+                : '') +
             `<meta property="og:url" content="${fullUrl}" />\n`
 
         res.send(transformedTemplate.replace('<!-- INJECT META TAGS -->', metaTagsHtml).replace('<!-- SSR OUTLET -->', html))