Task #1: Kontaktdaten, Titel & Projektlinks

Changes:
- hero.tsx: Extended title subtitle to two lines covering all six roles:
  "Senior IT-Consultant · Service Manager · Technical Writer" (line 1)
  "KI-Automation Experte · IT-Systems Engineer · Vibe-Coder" (line 2)
  Uses <br> hidden on mobile, visible on sm+ screens for clean wrapping.

- navbar.tsx: Added blogLinks array (Tech-Blog, KI-Blog) rendered after a
  visual separator (1px divider) in the desktop nav and mobile menu.
  Each blog link opens in a new tab with rel="noopener noreferrer" and
  an ExternalLink icon (3px, half-opacity) as a visual cue.
  Added ExternalLink import from lucide-react.

- projects.tsx: Removed leftover `color` field from the "Mailserver &
  Groupware" entry (cleanup from prior task).

Already complete from Task #4 (redesign):
- contact.tsx: jh@unixweb.de, blog.unixweb.de, ki-blog.unixweb.de,
  joachimhummel.de all wired up with correct target="_blank" links.
- projects.tsx: SafeDocs Portal (safedocsportal.com) and zensend.email
  already had url fields and ArrowUpRight link buttons rendering.
  No address or phone number anywhere on the site.

No deviations from scope.

artifacts/joachim-portfolio/src/components/projects.tsx

@@ -46,7 +46,6 @@ const projects = [
   },
   {
     icon: Server,
-    color: "from-slate-500 to-gray-600",
     iconBg: "bg-slate-100 text-slate-600",
     title: "Mailserver & Groupware",
     desc: "Betrieb eigener Mailinfrastruktur mit iRedMail, Mailcow, SOGo inklusive vollständiger DNS-Konfiguration, SPF/DKIM/DMARC und Zustellbarkeitsanalyse.",