Merge pull request #1860 from hunicus/npm-install-note

Update npm install command and node.js requirements

backend/README.md

@@ -77,13 +77,13 @@ Query OK, 0 rows affected (0.00 sec)
 
 #### Build
 
-_Make sure to use Node.js 16.15 and npm 7._
+_Make sure to use Node.js 16.10 and npm 7._
 
 Install dependencies with `npm` and build the backend:
 
 ```
 cd backend
-npm install # add --prod for production
+npm install
 npm run build
 ```