Add #archlinux-staff off-/onboarding instructions

.gitlab/issue_templates/Offboarding.md

@@ -16,6 +16,7 @@ This template should be used for offboarding Arch Linux team members.
 - [ ] Remove user email by reverting instructions from `docs/email.md`.
 - [ ] Set user to inactive in archweb: https://www.archlinux.org/admin/auth/user/
 - [ ] Remove member from [staff mailing lists](https://lists.archlinux.org/admin/staff/members)
+- [ ] Ask the user to leave `#archlinux-staff` on Freenode and forget the password
 
 ## TU/Developer offboarding checklist
 

.gitlab/issue_templates/Onboarding.md

@@ -17,6 +17,7 @@ It can also be used as a reference for adding new roles to an existing team memb
 - [ ] Create a new user in archweb: https://www.archlinux.org/devel/newuser/
       This is also linked in the django admin backend at the top
 - [ ] Subscribe user to internal [staff mailing list](https://lists.archlinux.org/admin/staff/members/add)
+- [ ] Give the user access to `#archlinux-staff` on Freenode
 
 ## Developer onboarding checklist