Add notifications subcomand (#148)

rm Aliase news for now

show read notifications not supported jet

add notifications subcomand

Co-authored-by: 6543 <6543@obermui.de>
Reviewed-on: https://gitea.com/gitea/tea/pulls/148
Reviewed-by: Lunny Xiao <xiaolunwen@gmail.com>
Reviewed-by: mrsdizzie <info@mrsdizzie.com>

main.go

@@ -43,6 +43,7 @@ func main() {
 		&cmd.CmdLabels,
 		&cmd.CmdTrackedTimes,
 		&cmd.CmdOpen,
+		&cmd.CmdNotifications,
 	}
 	app.EnableBashCompletion = true
 	err := app.Run(os.Args)