Update content & design (#75)

Reviewed-on: https://home.schmelczer.dev/git/git/andras/schmelczer-dev/pulls/75

src/content/projects/_assets/vault-link.svg

@@ -0,0 +1,47 @@
+<svg width="200" height="200" viewBox="0 0 200 200" xmlns="http://www.w3.org/2000/svg">
+  <defs>
+    <linearGradient id="grad1" x1="0%" y1="0%" x2="100%" y2="100%">
+    <stop offset="0%" style="stop-color:#4A90E2;stop-opacity:1" />
+    <stop offset="100%" style="stop-color:#357ABD;stop-opacity:1" />
+    </linearGradient>
+  </defs>
+
+  <!-- Background circle -->
+  <circle cx="100" cy="100" r="90" fill="url(#grad1)" opacity="0.15"/>
+
+  <!-- Main vault icon -->
+  <g transform="translate(100, 100)">
+    <!-- Vault body -->
+    <rect x="-45" y="-50" width="90" height="80" rx="8" fill="none" stroke="url(#grad1)" stroke-width="6"/>
+
+    <!-- Vault door circle -->
+    <circle cx="0" cy="-10" r="22" fill="none" stroke="url(#grad1)" stroke-width="5"/>
+    <circle cx="0" cy="-10" r="14" fill="none" stroke="url(#grad1)" stroke-width="3"/>
+    <circle cx="0" cy="-10" r="6" fill="url(#grad1)"/>
+
+    <!-- Vault handle -->
+    <line x1="0" y1="-4" x2="18" y2="-4" stroke="url(#grad1)" stroke-width="3" stroke-linecap="round"/>
+    <circle cx="18" cy="-4" r="4" fill="url(#grad1)"/>
+
+    <!-- Link chain -->
+    <g opacity="0.9">
+    <!-- Left link -->
+    <ellipse cx="-30" cy="40" rx="12" ry="8" fill="none" stroke="url(#grad1)" stroke-width="4"/>
+    <!-- Right link -->
+    <ellipse cx="30" cy="40" rx="12" ry="8" fill="none" stroke="url(#grad1)" stroke-width="4"/>
+    <!-- Center link connecting them -->
+    <ellipse cx="0" cy="40" rx="12" ry="8" fill="none" stroke="url(#grad1)" stroke-width="4"/>
+    </g>
+
+    <!-- Sync arrows (subtle) -->
+    <g opacity="0.5">
+    <!-- Clockwise arrow top-right -->
+    <path d="M 35 -35 Q 50 -35 50 -20 L 50 -15" fill="none" stroke="url(#grad1)" stroke-width="2.5" stroke-linecap="round"/>
+    <polygon points="50,-15 47,-22 53,-22" fill="url(#grad1)"/>
+
+    <!-- Counter-clockwise arrow bottom-left -->
+    <path d="M -35 25 Q -50 25 -50 10 L -50 5" fill="none" stroke="url(#grad1)" stroke-width="2.5" stroke-linecap="round"/>
+    <polygon points="-50,5 -47,12 -53,12" fill="url(#grad1)"/>
+    </g>
+  </g>
+</svg>