Split out docs, better error handling when database config doesn't exist

config/default.json

@@ -1,10 +1,10 @@
 {
-    "database": {
-        "engine": "mysql",
-        "host": "db",
-        "name": "npm",
-        "user": "npm",
-        "password": "npm",
-        "port": 3306
-    }
+  "database": {
+    "engine": "mysql",
+    "host": "db",
+    "name": "npm",
+    "user": "npm",
+    "password": "npm",
+    "port": 3306
+  }
 }