Add more command shorthands (#307)

add more command aliases

breaking: s/notif/n

Co-authored-by: Norwin Roosen <git@nroo.de>
Reviewed-on: https://gitea.com/gitea/tea/pulls/307
Reviewed-by: 6543 <6543@obermui.de>
Reviewed-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-Authored-By: Norwin <noerw@noreply.gitea.io>
Co-Committed-By: Norwin <noerw@noreply.gitea.io>

cmd/pulls/checkout.go

@@ -19,6 +19,7 @@ import (
 // CmdPullsCheckout is a command to locally checkout the given PR
 var CmdPullsCheckout = cli.Command{
 	Name:        "checkout",
+	Aliases:     []string{"co"},
 	Usage:       "Locally check out the given PR",
 	Description: `Locally check out the given PR`,
 	Action:      runPullsCheckout,