feat(website): rewrite hero headline and switch brand domain to .eu

Hero headline was a broken comma-splice ("Den produktivitetssuite, dine data
bliver i Danmark med."); replace with a clean two-sentence line in both
languages:
  da: "Din digitale arbejdsplads. Data der bliver i EU."
  en: "Your digital workplace. Data that stays in the EU."

Also move all brand references off the unowned dezky.com to dezky.eu
(status page, app dashboard mockup, config/comments). External domains
(zulip.com, Google Fonts) are left untouched.

apps/website/nuxt.config.ts

@@ -1,4 +1,4 @@
-// Nuxt 4 configuration for the Dezky public marketing site (dezky.com).
+// Nuxt 4 configuration for the Dezky public marketing site (dezky.eu).
 //
 // Unlike apps/portal and apps/operator this surface is fully public — no
 // OIDC, no sessions, no platform-api coupling. It can be statically