[blog] Add post about v5 Migration guide update

docs/pages/blog/migration-update.js

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+import * as React from 'react';
+import TopLayoutBlog from 'docs/src/modules/components/TopLayoutBlog';
+import { docs } from './migration-update.md?@mui/markdown';
+
+export default function Page() {
+  return <TopLayoutBlog docs={docs} />;
+}

docs/pages/blog/migration-update.md

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+---
+title: Why you should migrate to Material UI v5 today
+description: We have completely revamped our Migration guide to reduce friction when upgrading to v5. Get started now!
+date: 2022-06-15T00:00:00.000Z
+authors: ['samuelsycamore']
+card: true
+tags: ['News', 'MUI Core']
+---
+
+Are you still using Material UI v4 in 2022?
+
+What are you thinking?! 😛 The [community is migrating](https://npm-stat.com/charts.html?package=@mui/material,@material-ui/core), don't stay behind.
+
+We [released v5 in late 2021](/blog/mui-core-v5/), and since then, we've seen a steady migration of users over to the new packages.
+This is exciting for us, because we're super proud of all the improvements that were shipped with v5.
+
+But it seems as though a fair share of users are still hesitant to make the jump.
+This could be because v5 contains many breaking changes from v4, so the migration can be a large undertaking.
+
+That's why we've completely revamped our [v4 -> v5 migration guide](https://mui.com/material-ui/migration/migration-v4/)—to help reduce the amount of friction you might encounter when updating to v5.
+
+We hope it helps!
+Be sure to check out [the updated migration guide](https://mui.com/material-ui/migration/migration-v4/) in the Material UI docs.
+
+## Why you should upgrade to v5
+
+Here are the top 5 reasons why you should upgrade to v5 ASAP.
+
+### 1. React 18 support
+
+Material UI v5 is the only version that fully supports [React 18](https://reactjs.org/blog/2022/03/29/react-v18.html), so you'll need to update if you want to take advantage of the latest and greatest React features.
+
+### 2. New style engine
+
+One of the biggest changes in v5 is the replacement of JSS with [Emotion](https://emotion.sh/docs/introduction) as the default style engine.
+This offers significant advancements in performance when it comes to dynamic styles, and we also believe that it leads to a much more enjoyable developer experience.
+
+Emotion unlocks many new customization options that developers had been requesting for years, such as custom style utility props, color variants, and custom theme variants.
+Check out [this RFC on GitHub](https://github.com/mui/material-ui/issues/22342) for details about this change.
+
+![Screenshot of the new style engine GitHub issue in Material UI's repository](/static/blog/migration-update/style-engine.png)
+
+### 3. Better customization tools
+
+Material UI v5 introduces the `sx` prop, which opens up a whole new realm of possibility for applying custom styles.
+Now you can apply style rules to individual components without needing to involve the `styled()` API, which would be overkill when dealing with one-off styles.
+
+The `sx` prop lets you work with a superset of CSS, making it very intuitive to pick up and start using if you're already comfortable with CSS.
+
+```tsx
+import * as React from 'react';
+import Box from '@mui/material/Box';
+
+export default function BoxSx() {
+  return (
+    <Box
+      sx={{
+        width: 300,
+        height: 300,
+        backgroundColor: 'primary.dark',
+        '&:hover': {
+          backgroundColor: 'primary.main',
+          opacity: [0.9, 0.8, 0.7],
+        },
+      }}
+    />
+  );
+}
+```
+
+### 4. IntelliSense prop descriptions
+
+All prop descriptions are now written in TypeScript, which means that you can access details about the usage of a given prop right inside of your IDE—no need to seek out the official documentation to find this information.
+
+![Screenshot of IntelliSense tooltip showing the details about the Material UI Badge component](/static/blog/migration-update/intellisense-tooltip.png)
+
+### 5. Upcoming CSS variables support
+
+[CSS variables](https://developer.mozilla.org/en-US/docs/Web/CSS/Using_CSS_custom_properties) will help us solve a lot of customization issues in the future.
+One of them is the dark mode flashing issue that has been requested for a long time.
+
+More importantly, this feature is opt-in if you are using Material UI v5!
+You can check out the progress on this effort [with the issue #32049](https://github.com/mui/material-ui/issues/32049).
+
+## Upgrade now
+
+What are you waiting for?
+Jump into the [newly revised migration documention](https://mui.com/material-ui/migration/migration-v4/) and get started today.
+
+Let us know if you have any questions along the way!