feat(website): Umami analytics (conversion + CTA events)

Add the Umami tracker (cookieless, no consent banner) in the document head,
limited to the production hostnames via data-domains so dev traffic doesn't
pollute the stats. Pageviews are auto-tracked per page and locale.

Custom events on the key funnel:
- demo-request (demo form submit, with teamSize)
- partner-application (partner form submit, with type)
- book-demo (every "Book a demo" CTA click) via data-umami-event
- login (clicks through to the app)

Also fix the mobile nav menu links, which weren't localized (would drop
Danish visitors back to English).

apps/website/nuxt.config.ts

@@ -49,6 +49,17 @@ export default defineNuxtConfig({
       meta: [
         { name: 'theme-color', content: '#FAFAF7' },
       ],
+      // Umami — privacy-friendly, cookieless analytics (matches the cookie
+      // policy; no consent banner needed). data-domains limits tracking to the
+      // production hostnames so localhost/dev traffic doesn't pollute stats.
+      script: [
+        {
+          src: 'https://umami.coolify.lastcloud.io/script.js',
+          defer: true,
+          'data-website-id': '639dcd4c-1cb3-4edb-a2a2-6e9cf69348d4',
+          'data-domains': 'dezky.eu,www.dezky.eu',
+        },
+      ],
     },
   },