Add twitter preview

Signed-off-by: Jakub Sokołowski <jakub@status.im>

routes/index.js

@@ -201,6 +201,9 @@ router.get('/qr_card/:data(*)', async (req, res) => {
 `.trim())
 })
 
+/* provide rootUrl to all templates */
+router.use((req, res, next) => { res.app.locals.rootUrl = utils.makeUrl(req); next(); })
+
 router.get('/health', (req, res) => res.send('OK'))
 
 router.get('/b/:url(*)', handleSite)      

views/index.ejs

@@ -26,7 +26,10 @@
 <% } -%>
 
     <!-- Formatting for Twitter link unfurling to fit QR code. -->
-    <meta name="twitter:card" content="summary_large_image">
+    <meta name="twitter:card" content="summary" />
+    <meta name="twitter:site" content="@ethstatus" />
+    <meta property="twitter:image" content="<%= rootUrl %>/img/logo.jpg" />
+    <meta property="twitter:image:alt" content="Status logo" />
 
 <% if (locals.path) { -%>
     <meta property="status-im:target" content="<%= mainTarget %>" />