Remove advisory board.

config/_default/params.toml

@@ -57,7 +57,7 @@ show_categories = true
 [announcement]
 enable = true
 expire_days = 7
-content = "2025 Update: Check out our new [advisory board](/about)."
+content = "August Update: Winding down the [conferences](/news/winding-down)."
 
 # seo meta data for OpenGraph / Twitter Card
 # seo module: https://github.com/gethugothemes/hugo-modules/tree/master/seo-tools/basic-seo