Full draft of working with ASEs and a related update to ASE PTO planning

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This MR contains my proposed page for explaining how non-ASEs can work with ASEs and their accounts. It also contains an updated version of the PTO Planning page based to align correctly with the other page.

I ask that current ASEs ( @klang , @harishsr , @ulisesf , @tmarsh1 and @dkua1 ) review the MR and offer suggestions to make the standards proposed here align well with the best practices they use, or think we should all use.

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Commits

• Full draft of working with ASEs and a related update to ASE PTO planning

---

content/handbook/support/enhanced-support-offerings/offering-assigned-support-engineer/ase-workflows-and-standards/planning-pto-as-ASE.md

@@ -30,10 +30,11 @@ will be out.
 - Review the accounts and open tickets with your backups
 - Inform the customers and account teams of your upcoming absence and your
   coverage plan
-
-Help the SEs who will be monitoring your accounts to setup a notifications in
-Zendesk using the [notifications app](/handbook/support/readiness/operations/docs/zendesk/apps/global-apps/#notifications-app)
-so that they will be notified of new tickets.
+- Help the SEs who will be monitoring your accounts to configure the
+  [Zendesk notifications app](/handbook/support/readiness/operations/docs/zendesk/apps/global-apps/#notifications-app)
+  to notify them upon the arrival of new tickets.
+- Use the [Delegate Tasks feature of `Time Off by Deel` in Slack](https://help.letsdeel.com/hc/en-gb/articles/11901927070737-How-To-Request-Time-Off-With-Deel-Plugin#h_01GNY1Q325CCDEMASHZCMMY4RS)
+  to indicate who is covering for each of your accounts
 
 ### Returning from PTO