chore: Remove defunct 'lerna-changelog' config
chore: Remove defunct 'lerna-changelog' config

We use conventional-changelog now, via the `--conventional-commits` flag.

Closes #1375
[skip ci]

lerna/lerna,lerna/lerna,sebmck/lerna,kittens/lerna,lerna/lerna,evocateur/lerna,evocateur/lerna