feat: ignore .git/ by default

[skoriop]

Closes #1387 (breaking change!)

.git/ is now ignored by default even with --hidden / -H.

Use --no-ignore / -I or --no-ignore-vcs to override.

[tmccombs]

I am in favor of including this change.

I left one small bit of feedback.

[sharkdp]

Thank you for making this change. I'm also in favor of it. But I do think that this needs a bit of documentation and testing. I would suggest we adapt the --help texts for --hidden to reflect these changes. Otherwise, I think this can be very surprising.

As for the tests, I think we should at least add three simple checks that would assert that:

• results in .git are not included when using --hidden
• results in .git are not included when using --no-ignore
• results in .git are included when using --hidden --no-ignore

At least that is my understanding how this feature should work?

[skoriop]

Yup, that is how it should work.

[tmccombs]

I'll write some tests and docs.