[Modified/Added] Git-Page Theme Change And Navigation Link Added

sections/account_management_billing_support.md

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 - **Cost Explorer**: View current usage (detailed) and forecast usage
 - **Billing Alarms**: in us-east-1 – track overall and per-service billing
 - **Budgets**: more advanced – track usage, costs, RI, and get alerts
-- **Savings Plans**: easy way to save based on long-term usage of AWS
+- **Savings Plans**: easy way to save based on long-term usage of AWS
+
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+[👈 Machine Learning](./machine_learning.md)           [Home](../README.md)           [Advanced Identity 👉](./advanced_identity.md)