[Logging] use different console.logs on different usage

[ryuina]

YoungleehanKorean/server/index.js

Line 75 in a45be18

.catch((err) => console.log(err));

In javascript there are many types of console.log

• console.log
• console.debug
• console.warn
• console.error

https://developer.mozilla.org/ko/docs/Web/API/console#%EB%A9%94%EC%84%9C%EB%93%9C

And if you use each methods on the usage. So in this case, you can log error log with console.error then it will be printed with console with "error" color