Migrate outboarding page from the intranet to sysadm docs

Related to T3154

sysadm/user-management/outboarding.rst

@@ -3,7 +3,58 @@
 Reference: Outboarding checklist
 ================================
 
-.. todo::
-   This page is a work in progress. For now, please refer to the `existing documentation
-   <https://intranet.softwareheritage.org/wiki/Outboarding>`_.
+This page describes outboarding process for staff people, i.e., what to do when they
+leave the project.
 
+Administrative
+--------------
+
+At the entrance desk, give back:
+
+- Inria access badge and office keys
+- cantine card
+
+.. _outboarding_technical_setup:
+
+Technical setup
+---------------
+
+- lock \*nix account on project machines
+
+   - Edit puppet data for the user
+
+      - Change password hash to '!' in the swh-private-data repository
+      - Change shell to /bin/false
+
+   - let puppet push itself :)
+
+- phabricator: remove user from groups Developers, Members, Interns (if
+  applicable)
+- revoke `VPN
+  <https://intranet.softwareheritage.org/wiki/VPN#Revoking_a_client_certificate>`_
+  certificate
+
+.. _outboarding_development:
+
+Development
+-----------
+
+- review open and assigned tasks in `Phabricator <https://forge.softwareheritage.org>`_
+  and unassign them as needed.
+
+.. _outboarding_communication:
+
+Communication
+-------------
+
+- unsubscribe from `mailing lists
+  <https://intranet.softwareheritage.org/wiki/Mailing_lists>`_: swh-team
+- uninvite/kick from `IRC channels
+  <https://intranet.softwareheritage.org/wiki/IRC_channels>`_: #swh-team
+
+.. _outboarding_see_also:
+
+See also
+--------
+
+- `Onboarding <onboarding>`_

[Phabricator Migration user]

Some references in the commit message have been migrated:

• T3154 is now swh/infra/sysadm-environment#3154 (closed)