bento archive files are ignored by bento init's global gitignore

[underyx]

Just a note that came up on a call. I think there's some confusing behavior where

• bento init gitignores .bento/** globally
• bento archive creates .bento/archive.json and suggests pushing it

The least we could do is suggest using git add -f when creating a new archive.

It's also possible that I'm misremembering something here, so this issue needs to be verified before any work done.

[underyx]

cc @dlukeomalley