TPA-RFC-73: Implement decision about 2025 roadmap

During the TPA roadmap meeting of 2024-11-18 we decided to bump the
priority of 2 items to 2025: Monitoring migration and coming up with a
plan for authentication.

refs team#41721

policy/tpa-rfc-73-tails-infra-merge-roadmap.md

@@ -1065,8 +1065,10 @@ flowchart TD
     - Implement commit signing
     - [EYAML](#eyaml) (keep)
     - [Puppet server](#puppet-server) (merge)
+  - A plan for [Authentication](#authentication)
   - [Bitcoin](#bitcoin) (retire)
   - [LimeSuvey](#limesurvey) (merge)
+  - [Monitoring](#monitoring) (migrate)
   - [Website](#website) (merge)
 - **2026:**
   - Basic system functionality:
@@ -1074,7 +1076,6 @@ flowchart TD
     - [Backups](#backups) (migrate)
     - [DNS](#dns) (migrate)
     - [Firewall](#firewall) (migrate)
-    - [Monitoring](#monitoring) (migrate)
     - [TLS](#tls) (migrate)
     - [Web servers](#web-servers) (merge)
   - [Mailman](#mailman) (merge)