remove header

Author: lindsey-volta

gatsby-node.js

@@ -34,10 +34,3 @@ exports.onPostBuild = () => {
     }
   })
 }
-
-exports.onCreateDevServer = ({ app }) => {
-  app.use((req, res, next) => {
-    res.setHeader("Cross-Origin-Opener-Policy", "unsafe-none")
-    next()
-  })
-}