fix: increase VC pricing iframe height to avoid scrolling

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: paddymul

docs/source/articles/theme-customization.rst

@@ -512,7 +512,7 @@ and three columns where the last one says "Call us for pricing".
 .. raw:: html
 
    <iframe src="../themes/vc-pricing.html"
-           style="width:100%; height:460px; border:1px solid #e8e8f0; border-radius:12px; margin:1em 0;">
+           style="width:100%; height:700px; border:1px solid #e8e8f0; border-radius:12px; margin:1em 0;">
    </iframe>