Revise migration overview and application architecture

Updated the document to improve clarity and structure, including a new overview section and enhanced descriptions of application architecture concepts.

Author: brown9804

0_Azure/8_AzureApps/demos/1_fromMulti-containerWebApp_toAKS.md

@@ -1,4 +1,4 @@
-# Migrating from multi-container Web Apps to AKS (Azure Kubernetes Service) - Overview 
+# Migrating from <br/> Multi-container Web Apps to AKS - Overview 
 
 Costa Rica
 
@@ -15,6 +15,9 @@ Last updated: 2025-10-23
 
 </details>
 
+> [!NOTE]
+> If you have any questions or need further clarification, please reach out to your Microsoft account team or contact Microsoft directly: [Microsoft Sales and Support](https://support.microsoft.com/contactus?ContactUsExperienceEntryPointAssetId=S.HP.SMC-HOME) for additional support and guidance, or
+
 | Component | Role | 
 | --- | --- | 
 | Containers | Lightweight, `portable units that package code, dependencies, and runtime together`. | 
@@ -23,8 +26,30 @@ Last updated: 2025-10-23
 | Kubernetes (K8s) | Orchestrates containers across many hosts (nodes) | 
 | AKS | Azure’s managed Kubernetes `handles infrastructure, scaling, and updates for you` | 
 
-> [!NOTE]
-> If you have any questions or need further clarification, please reach out to your Microsoft account team or contact Microsoft directly: [Microsoft Sales and Support](https://support.microsoft.com/contactus?ContactUsExperienceEntryPointAssetId=S.HP.SMC-HOME) for additional support and guidance, or
+## Overview 
+
+`Monolithic → Microservices → Containerization → Orchestration` This progression improves scalability, resilience, and agility for modern cloud-native applications.
+
+<div align="center">
+  <img width="778" height="369" alt="image" src="https://github.com/user-attachments/assets/23f6e6e9-1c37-47f5-afae-e5fcdf847d93" />
+</div>
+
+> - `Monolithic Application`: A single, large application that contains all components (Recruitment Website, Job Application, Job Vacancies, Recruiters, etc) bundled together.
+>   - The modules really rely on each other quite a bit.
+>   - It's tricky to scale features on their own.
+>   - Any updates mean we have to redeploy the whole app.
+> - `Transition to Microservices`: The monolithic app is split into smaller, independent services (Recruiters, Job Application, Job Vacancies).
+>   - Each service can be developed, deployed, and scaled independently.
+>   - Easier to maintain and adopt new technologies per service.
+> - `Docker`: Each microservice is packaged into application containers using Docker.
+>   - Provides portability across environments.
+>   - Ensures consistency between development and production.
+> - `Kubernetes`: Containers are deployed and managed in a Kubernetes cluster (K8s).
+>   - Handles orchestration: scaling, load balancing, self-healing.
+>   - Enables automated deployments and rolling updates.
+
+
+
 
 
 <!-- START BADGE -->