refract: tidy up structure

- db in folder

.gitignore

@@ -34,4 +34,4 @@ yarn.lock
 package.json
 package-lock.json
 db.json
-server/db backup.json
+db backup.json

server/src/app.js

@@ -3,8 +3,10 @@ import { config } from './config/config.js';
 
 // init database
 import { Low, JSONFile } from 'lowdb';
+import { join } from 'path';
 
-const adapter = new JSONFile(config.database.filename);
+const file = join('data/', config.database.filename);
+const adapter = new JSONFile(file);
 export const db = new Low(adapter);
 
 // dependencies