Take back control of hooks (#1006)

* git: delegate all server-side Git hooks (#1623)

* create hooks directories

* take control hooks back

* fix lint

* bug fixed and minor changes

* fix imports style

* fix migration scripts

main.go

@@ -30,7 +30,7 @@ func main() {
 	app.Commands = []cli.Command{
 		cmd.CmdWeb,
 		cmd.CmdServ,
-		cmd.CmdUpdate,
+		cmd.CmdHook,
 		cmd.CmdDump,
 		cmd.CmdCert,
 		cmd.CmdAdmin,