feat(public-docsite-v9): add official platform support docs including React Versions

apps/public-docsite-v9/src/Concepts/ReactVersionSupport.stories.mdx

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+import { Meta } from '@storybook/addon-docs';
+
+<Meta title="Concepts/Developer/React Version Support" />
+
+# React Version Support
+
+> ℹ️ **Note**: Our migration docs focus solely on FluentUI related changes.
+
+If you're migrating between React major versions, please refer to the official React documentation for comprehensive migration guides.
+
+For migrating your codebase TypeScript types, you can leverage [Types React Codemod](https://github.com/eps1lon/types-react-codemod)
+
+## React 17
+
+Full support starting `@fluentui/react-components` v9.0.0.
+
+## React 18
+
+Full support starting `@fluentui/react-components` v9.65.0.
+
+### Migration
+
+> 💡 Check Following PR for further details https://github.com/microsoft/fluentui/pull/34456
+
+#### Runtime/API changes:
+
+NONE
+
+#### TypeScript types changes:
+
+##### Slot Children as a Function
+
+Because `@types/react@18` Breaking Changes, we needed to loosen `Slot` children property to `any`.
+
+This change will affect users that use `Slot` children as a function in conjunction with TypeScript strict mode.
+
+If that's your case, TypeScript will fail on `noImplicitAny`. To mitigate this you need to add type assertions (`satisfies SlotRenderFunction<T>`)
+
+Before:
+
+```tsx
+import * as React from 'React';
+
+<Button
+  // children was inferred as union of ReactNode and SlotRenderFunction
+  icon={{ children: (Component, props) => <Component {...props /> }}
+>
+Label
+</Button>
+```
+
+After:
+
+```tsx
+import * as React from 'React';
+import { type SlotRenderFunction } from '@fluentui/react-utilities';
+
+<Button
+  icon={{
+    // children is now `any` and needs to be asserted as `SlotRenderFunction`
+    children: ((Component, props) => <Component {...props} />) satisfies SlotRenderFunction<
+      React.ComponentProps<'span'>
+    >,
+  }}
+>
+  Label
+</Button>;
+```

apps/public-docsite-v9/src/Concepts/SupportedPlatforms.stories.mdx

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+import { Meta } from '@storybook/addon-docs';
+
+<Meta title="Concepts/Developer/Supported Platforms" />
+
+# Supported Platforms
+
+Learn about the platforms that are supported by Fluent UI React.
+
+## Browser
+
+Fluent UI supports the latest, stable releases of all major browsers and platforms.
+
+Please refer to the [Browser Support Matrix](/docs/concepts-developer-browser-support-matrix--docs) for more details.
+
+## React
+
+Fluent UI fully supports React versions 17 and 18.
+
+Please refer to the [React Version Support](/docs/concepts-developer-react-version-support--docs) for more details.
+
+## TypeScript
+
+Fluent UI fully supports TypeScript versions >=3.9.