copy redirect file into build

Makefile

@@ -4,13 +4,16 @@ bootstrap:
 	./scripts/download-readmes.js
 	./scripts/download-sponsors.js
 
-build: build-repl build-docusaurus
+build: build-repl build-docusaurus copy-redirects
 
 build-repl:
 	./node_modules/.bin/webpack
 
 build-docusaurus:
 	cd website && yarn && yarn build
 
+copy-redirects:
+	cp ./_redirects ./website/build/babel
+
 serve:
 	cd website && yarn start