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/utils/landingTokens.ts

@@ -74,6 +74,6 @@ export function makeTheme(dark: boolean): DezkyTheme {
       }
 }
 
-// The destination the nav/login CTA points at. Production is app.dezky.com;
+// The destination the nav/login CTA points at. Production is app.dezky.eu;
 // locally the portal runs at app.dezky.local.
 export const APP_URL = 'https://app.dezky.local'