style: adjust background text positioning in Open Graph template

- Increase the top offset of the background text to 90px to improve visual balance and spacing
- Update the generated og.png asset to reflect the layout changes in the template

Author: vinsidious

website/og-template.html

@@ -82,7 +82,7 @@
     line-height: 1.8;
     white-space: pre;
     position: absolute;
-    top: 70px;
+    top: 90px;
     left: 140px;
     opacity: 0.35;
     scale: 1;