fix: blank page when javascript is disabled (#1426)

Co-authored-by: Daniel Roe <[e-mail]>

nuxt.config.ts

···
 
   htmlValidator: {
     enabled: !isCI || (provider !== 'vercel' && !!process.env.VALIDATE_HTML),
+    options: {
+      rules: { 'meta-refresh': 'off' },
+    },
     failOnError: true,
   },
 

server/plugins/fallback-ui.ts

···
+export default defineNitroPlugin(nitroApp => {
+  if (import.meta.prerender) {
+    nitroApp.hooks.hook('render:html', (html, { event }) => {
+      if (event.path === '/200.html') {
+        html.head.push('<noscript><meta http-equiv="refresh" content="1"></noscript>')
+      }
+    })
+  }
+})