refactor:

config/config.go

@@ -0,0 +1,9 @@
+package config
+
+type Config struct {
+	Env         string `env:"ENV" env-default:"prod"`
+	Pandoc      string `env:"PANDOC" required:"true"`
+	Auth        string `env:"AUTH" required:"true"`
+	Address     string `env:"ADDRESS" required:"true"`
+	PostgresDSN string `env:"POSTGRES_DSN" required:"true"`
+}