fix: meta content templates (#429)

* examples: add content templates to ssr example

* fix: improve meta content templates

* chore: cleanup debug helper

* refactor: split long if into variables

examples/server.js

@@ -32,11 +32,12 @@ app.use(express.static(__dirname))
 
 app.use(async (req, res, next) => {
   if (!req.url.startsWith('/ssr')) {
-    next()
+    return next()
   }
 
   try {
-    const html = await renderPage()
+    const context = { url: req.url }
+    const html = await renderPage(context)
     res.send(html)
   } catch (e) {
     consola.error('SSR Oops:', e)