BranchesWithRemotes uses the Git config to determine which branches also exist on the remotes.

CurrentBranch gets the current local branch.

DefaultBranch gets the default branch (like main) from the remote refs.

IsGitDir checks if the current working directory containers a .git folder.

LocalBranches gets a list of all local branches as a slice of strings.

RemoteFromHead gets the remote where the HEAD is.