* feat: by default dont open PRs

this allows us to enable this only on repos that are actively being maintained/kept up to date. for others, it allows us to come back whenever and see what would need updates

* disable automerges

* Update default.json

This reverts commit 45385d6a17188090550d2bb918f415752481df1d.

this is nice for some things (like helmcharts) but annoying for repos where I don't deploy all commits from main. Better activate it per repo, where wanted.