.arcconfig

rebase: drop --style option

It existed from the very start, but I don't think the rebase command does
support log-like templates.

{
    "conduit_uri": "https://phab.mercurial-scm.org/api",
    "repository.callsign": "HG",
    "arc.land.onto.default": "@",
    "base": "hg:.^"
}