Updated readme.md to include additional checklists for acr/aks, function apps, fix key

[asears]

Fixes: #

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Short description of what this resolves:

• Clarify Key Vault naming.
• Additional checklists

Proposed changes:

• Checklists for AKS/ACR
• Best practices checklists for function apps / app services
• Diagnostics logging
• Alerts & Budgeting
• Tagging

👍 Thank you!