Update DMR link, add board members to about page

- Rename "DMR Editor" to "DMR İndir" across nav and about page
- Add target="_blank" support to Header component
- Add all 5 board members with QRZ.com links to hakkimizda page
- Update DMR blog post with channel list section
- Remove "Liderlik" tagline from board section

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/pages/hakkimizda.astro

@@ -120,7 +120,7 @@ const metadata = {
         description: 'DMR, APRS, FT8 gibi dijital mod teknolojileri konusunda eğitim ve uygulama desteği sağlıyoruz.',
         icon: 'tabler:device-laptop',
         callToAction: {
-          text: 'DMR Editor',
+          text: 'DMR İndir',
           href: 'https://dmr.radio.org.tr/',
           target: '_blank',
         },
@@ -188,12 +188,63 @@ const metadata = {
 
   <Features2
     title="💼 Yönetim Kurulu"
-    tagline="👑 Liderlik"
-    columns={1}
+
+    columns={3}
     items={[
       {
-        title: '📻 Başkan',
-        description: 'Cüneyt Şahna (TA1GP)',
+        title: 'Cüneyt Şahna',
+        description: '<strong>TA1GP</strong> · Başkan',
+        icon: 'tabler:star',
+        callToAction: {
+          text: 'QRZ.com',
+          href: 'https://www.qrz.com/db/TA1GP',
+          target: '_blank',
+          variant: 'link',
+        },
+      },
+      {
+        title: 'Buğra Canata',
+        description: '<strong>TA1JS</strong> · Yönetim Kurulu Üyesi',
+        icon: 'tabler:user',
+        callToAction: {
+          text: 'QRZ.com',
+          href: 'https://www.qrz.com/db/TA1JS',
+          target: '_blank',
+          variant: 'link',
+        },
+      },
+      {
+        title: 'Fatih Önder',
+        description: '<strong>TB1TFO</strong> · Yönetim Kurulu Üyesi',
+        icon: 'tabler:user',
+        callToAction: {
+          text: 'QRZ.com',
+          href: 'https://www.qrz.com/db/TB1TFO',
+          target: '_blank',
+          variant: 'link',
+        },
+      },
+      {
+        title: 'Muhammed Cevad Turan',
+        description: '<strong>TA1XTA</strong> · Yönetim Kurulu Üyesi',
+        icon: 'tabler:user',
+        callToAction: {
+          text: 'QRZ.com',
+          href: 'https://www.qrz.com/db/TA1XTA',
+          target: '_blank',
+          variant: 'link',
+        },
+      },
+      {
+        title: 'Ayhan Asar',
+        description: '<strong>TA2CDV</strong> · Yönetim Kurulu Üyesi',
+        icon: 'tabler:user',
+        callToAction: {
+          text: 'QRZ.com',
+          href: 'https://www.qrz.com/db/TA2CDV',
+          target: '_blank',
+          variant: 'link',
+        },
       },
     ]}
   />