Rename extended JSON file to data.extended.json

This is to align better with data.json and data.schema.json.

Author: foolip

.gitignore

@@ -6,4 +6,5 @@ packages/**/LICENSE.txt
 packages/web-features/data.json
 packages/web-features/data.schema.json
 packages/web-features/types.ts
+data.extended.json
 index.js

scripts/build.ts

@@ -81,7 +81,7 @@ function buildExtendedJSON() {
   }
 
   fs.writeFileSync(
-    new URL("./web-features.extended.json", rootDir),
+    new URL("./data.extended.json", rootDir),
     stringify(data),
   );
 }