Make `logs/` entry in `.gitignore` optional

[asmacdo]

babs init adds logs/ to the project's .gitignore unconditionally.

My first instinct was to let the user supply their own .gitignore, but that doesn't compose: babs appends entries throughout init, so a user-provided file would lose those appends. Cleaner interface is a single flag for just this one line:

• Default unchanged (add logs/ to .gitignore)
• New flag --no-ignore-logs to skip that entry
• Or better: --no-ignore logs so this can be extended to other optional gitignore appending.

Scope: just the logs/ entry. Other babs-appended .gitignore entries stay as-is.

[tien-tong]

How about --no-gitignore logs?

[asmacdo]

On the other hand... maybe my initial thinking wasn't too far off. Is there a reason we append to .gitignore in various places? Does it actually need to be dynamic, or could we just provide a default .gitignore which could be replaced by the user?

[tien-tong]

I don't see a reason why it has to be dynamic. This sounds good to me

we just provide a default .gitignore which could be replaced by the user

[asmacdo]

@djarecka would this affect you?

[asmacdo]

.gitignore is appended to by #369 but we could allow an override "base" gitignore