Update gitignore to include more common files or folders

[kishorliv]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/nestjs/nest/blob/master/CONTRIBUTING.md
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[x] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Other... Please describe:

What is the current behavior?

Link to the issue

Issue Number: 2471

What is the new behavior?

Adds more files and directories to gitignore

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[kishorliv]

I checked the tests added and docs updated points. I have not added them as its probably not necessary for this task. Let me know if they are required.

[kamilmysliwiec]

lgtm