[Temp] preview of SDK Selector, Keyless and updated CTA

docs/_partials/nextjs/create-first-user.mdx

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+1. Run your project with the following command:
+
+   <CodeBlockTabs options={["npm", "yarn", "pnpm"]}>
+     ```bash {{ filename: 'terminal' }}
+     npm run dev
+     ```
+
+     ```bash {{ filename: 'terminal' }}
+     yarn dev
+     ```
+
+     ```bash {{ filename: 'terminal' }}
+     pnpm dev
+     ```
+   </CodeBlockTabs>
+1. Visit your app's homepage at [http://localhost:3000](http://localhost:3000).
+1. Click "Sign up" in the header and authenticate to create your first user.

docs/_partials/nextjs/next-steps.mdx

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+<Cards>
+  - [Create a custom sign-in or sign-up page](/docs/references/nextjs/custom-sign-in-or-up-page)
+  - This tutorial gets you started with Clerk's `<SignInButton />` component, which uses the Account Portal. If you don't want to use the Account Portal, read this guide about creating a custom authentication page.
+
+  ---
+
+  - [Add custom onboarding to your authentication flow](/docs/references/nextjs/add-onboarding-flow)
+  - If you need to collect additional information about users that Clerk's Account Portal or prebuilt components don't collect, read this guide about adding a custom onboarding flow to your authentication flow.
+
+  ---
+
+  - [Protect specific routes](/docs/references/nextjs/clerk-middleware)
+  - This tutorial taught you that by default, `clerkMiddleware()` will not protect any routes. Read this reference doc to learn how to protect specific routes from unauthenticated users.
+
+  ---
+
+  - [Read user and session data](/docs/references/nextjs/read-session-data)
+  - Learn how to use Clerk's hooks and helpers to access the active session and user data in your Next.js app.
+
+  ---
+
+  - [Next.js SDK Reference](/docs/references/nextjs/overview)
+  - Learn more about the Clerk Next.js SDK and how to use it.
+
+  ---
+
+  - [Deploy to Production](/docs/deployments/overview)
+  - Learn how to deploy your Clerk app to production.
+</Cards>