Take etc/www/config.json out of revision control.

This file contains site-specific configuration. Instead, an
example.config.json is now provided.

etc/www/example.config.json

@@ -0,0 +1,15 @@
+{
+	"jwt": {
+		"secret": "",
+		"options": {
+			"expiresIn": 1800
+		}
+	},
+	"db": {
+		"user": "postgres",
+		"host": "localhost",
+		"database": "dougal",
+		"port": 5432,
+		"connection_string": "host=localhost port=5432 dbname=dougal user=postgres"
+	}
+}