Fix header

Author: fabien.menager

.github/workflows/static.yml

@@ -1,8 +1,5 @@
 name: Deploy site to Pages
 
-env:
-  NODE_ENV: production
-
 on:
   # Runs on pushes targeting the `main` branch. Change this to `master` if you're
   # using the `master` branch as the default branch.

docs/.vitepress/config.mts

@@ -8,7 +8,7 @@ const umamiScript: HeadConfig = ["script", {
 
 const baseHeaders: HeadConfig[] = [];
 
-const headers = process.env.NODE_ENV === "production" ?
+const headers = process.env.GITHUB_PAGES === "true" ?
     [...baseHeaders, umamiScript] :
     baseHeaders;