remove example.env as it is not used

lite/bin/setup

@@ -7,7 +7,6 @@ def setup!
     run  "bundle check > /dev/null 2>&1 || bundle install"
     run  "yarn install" if File.exist?("yarn.lock")
     run  "overcommit --install" if overcommit_present?
-    copy "example.env", ".env.development"
     test_local_env_contains_required_keys
     run  "bin/rails tmp:create db:prepare db:test:prepare db:seed"
   end