style: reduce bg luminance of default admonition

Signed-off-by: Akshay Mestry <[email protected]>

Author: xames3

theme/base/static/smart.css

@@ -13,7 +13,7 @@
     --accent: 0 0% 82%;
     --border: 0 0% 92%;
     --input: 0 0% 92%;
-    --light-accent: 0, 0%, 93%;
+    --light-accent: 0, 0%, 94%;
     --link: 216.35, 100%, 47%;
     --radius: 12px;
     --code-background: 0, 0%, 100%;