docs(add): add migration methods and tools documentation

pages/use-cases/migration-methods/index.mdx

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+---
+title: Migration methods and tools
+description: Discover the available migration methods and tools to move your infrastructure to Scaleway and develop your projects.
+---
+
+## Migration methods and tools
+
+Migrating to the cloud can take different forms depending on your infrastructure, business goals, and long-term strategy.
+
+Choosing the right method depends on your priorities: speed, cost, flexibility, or long-term innovation. Below are the main migration methods you can choose from when planning for your migration.
+
+<Tabs id="install">
+  <TabsTab label="Lift and Shift">
+
+    Lift and shift is the most direct migration strategy. Applications and workloads are moved “as-is” from their current environment to the cloud, with minimal to no modifications. It focuses on speed and simplicity rather than optimization.
+
+    **When to use it**
+
+    - You need to migrate quickly, with minimal downtime.
+    - Your priority is moving out of on-premises infrastructure or another provider.
+    - You want a foundation in the cloud before making further optimizations.
+</TabsTab>
+  <TabsTab label="Replatforming">
+
+   Replatforming involves making minor adjustments to workloads during migration to take advantage of cloud features, without fully redesigning the application.
+
+    **When to use it**
+
+    - You want to reduce operational complexity.
+    - Your goal is to gain some cloud-native benefits (e.g. automated scaling, managed storage).
+    - Your applications are stable but can benefit from optimizations.
+    </TabsTab>
+  <TabsTab label="Refactoring">
+
+    Refactoring goes further by modifying the application code to better align with cloud-native services and architectures.
+
+    **When to use it**
+
+    - You want to modernize applications for better scalability and resilience.
+    - You want to integrate managed services (databases, event-driven systems, etc.).
+    - Your current architecture is functional but starting to limit growth.
+</TabsTab>
+  <TabsTab label="Rearchitecting">
+
+    Rearchitecting means redesigning applications from the ground up to fully leverage cloud-native principles, such as microservices, serverless, and distributed computing.
+
+    **When to use it**
+
+    - Legacy systems limit innovation and agility.
+    - You want to build for long-term scalability and resilience.
+    - You need to support advanced workloads like AI, big data, or edge computing.
+  </TabsTab>
+  <TabsTab label="Replacement">
+
+    Instead of migrating an existing system, some organizations choose to replace applications with new cloud-native solutions or SaaS alternatives.
+
+    **When to use it**
+
+    - The existing system is outdated or too costly to adapt.
+    - SaaS or managed solutions provide more value.
+    - You want to simplify infrastructure and focus resources on core business goals.
+  </TabsTab>
+</Tabs>