Update logging quickstart sample

[freelerobot]

Improve the Logging quickstart in Node. Quickstart should work out of the box and contain all the instructions (in comments) so users can immediately see their logs.

Additional criteria:

• [ ] include comments on various ways to authenticate
• [ ] encourage users to log with standard log wrappers, demonstrated in Bunyan quickstart or Winston quickstart rather than directly writing LogEntries. Context: In an ideal world, customers should be able to use existing logging frameworks native to their language. With some simple appender/handler to also ship logs to Cloud Logging. Customers aren't locked into logging library syntax, thus it's easier to both onboarding and offboard off of these client libraries.
• [ ] comment that if users need more customizable logs, redirect to writing log entries

[rubiagatra]

Can I help @0xSage?

[losalex]

@rubiagatra, thanks a lot for reaching out and offering help and sorry for long time it takes to resolve this issue. Feel free to share here any specific samples/comments you think should be included in the resolution and we will try our best to incorporate those once we get to deal with this issue.