Add option to center env name (#683)

src/config/Config.zig

@@ -50,6 +50,7 @@ shutdown_cmd: []const u8 = "/sbin/shutdown -a now",
 shutdown_key: []const u8 = "F1",
 sleep_cmd: ?[]const u8 = null,
 sleep_key: []const u8 = "F3",
+text_in_center: bool = false,
 tty: u8 = build_options.tty,
 vi_default_mode: ViMode = .normal,
 vi_mode: bool = false,