Use monaco for the git hook editor (#13552)

Migrate git hook editor to monaco, replacing CodeMirror. Had to do a few
refactors to make the monaco instantiation generic enough to be of use.

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>

routers/repo/setting.go

@@ -787,7 +787,6 @@ func GitHooks(ctx *context.Context) {
 func GitHooksEdit(ctx *context.Context) {
 	ctx.Data["Title"] = ctx.Tr("repo.settings.githooks")
 	ctx.Data["PageIsSettingsGitHooks"] = true
-	ctx.Data["RequireSimpleMDE"] = true
 
 	name := ctx.Params(":name")
 	hook, err := ctx.Repo.GitRepo.GetHook(name)