website: ensure destination folders exist

Author: dominikh

website/build.sh

@@ -1,6 +1,8 @@
 #!/bin/sh
 set -e
 rm -rf ./public
+mkdir -p data
+mkdir -p content/docs/configuration/default_config
 go run ./cmd/generate_checks/generate_checks.go >data/checks.json
 go run ./cmd/generate_config/generate_config.go >content/docs/configuration/default_config/index.md