docs: Remove completion checklist from client portal guide

Getting Started/Client_Portal_Training_Guide.md

@@ -791,26 +791,6 @@ A: Tickets are retained indefinitely for your records and ours.
 
 ---
 
-## Completion Checklist
-
-Use this checklist to verify you've completed all training activities:
-
-### Week 1
-- [ ] Day 1: Logged in successfully, toured dashboard, bookmarked portal
-- [ ] Day 2: Created test ticket, viewed ticket list, added reply
-- [ ] Day 3: Attached screenshot, reviewed priorities, explored ticket details
-- [ ] Day 4: Viewed invoices, downloaded PDF, located payment option
-- [ ] Day 5: Reviewed recurring invoices, explored auto-pay setup
-
-### Week 2
-- [ ] Day 6: Reviewed assigned assets, noted warranty dates
-- [ ] Day 7: Browsed documents, checked domains and certificates
-- [ ] Day 8: Updated profile, reviewed contacts, changed password
-- [ ] Day 9: Accessed portal on mobile, reviewed security practices
-- [ ] Day 10: Completed all exercises, ready for independent use
-
----
-
 ## Sources & References
 
 - [ITFlow Official Documentation](https://docs.itflow.org/)