Minor improvements for react env files

packages/concordia-app/.env.development.example

@@ -8,5 +8,5 @@ PORT=7000
 
 # Variables needed in runtime (in browser)
 # Carefull, IPFS won't accept localhost as a valid hostname
-REACT_APP_RENDEZVOUS_HOST=localhost
+REACT_APP_RENDEZVOUS_HOST=127.0.0.1
 REACT_APP_RENDEZVOUS_PORT=9090

packages/concordia-app/.gitignore

@@ -8,9 +8,13 @@
 
 # misc
 .DS_Store
+.env
 .env.local
+.env.development
 .env.development.local
+.env.test
 .env.test.local
+.env.production
 .env.production.local
 
 npm-debug.log*