feat: add ledger theme to landing page

Author: ValerasNarbutas

index.html

@@ -201,7 +201,7 @@
     .preview-brutalist{ background: #f0f0e8; color: #000; }
     .preview-dashboard{ background: #1a1a2a; color: #60d0ff; }
     .preview-vaporwave{ background: linear-gradient(135deg, #1a0a2a, #0a1a3a); color: #ff80ff; }
-    .preview-manuscript{ background: #f5f0e8; color: #2a1a0a; }
+    .preview-manuscript{ background: #f5f0e8; color: #2a1a0a; }    .preview-ledger{ background: #e8f5ed; color: #1a3d1a; font-family: Georgia,serif; }
 
     .preview-label {
       position: absolute; bottom: 8px; right: 10px;