Update configuring-oauth-providers.mdx

[jordancalhoun]

Add missing signIn SvelteComponent for server side login step to work.

☕️ Reasoning

The guide gives an example of how to login with the server instead of client side javascript; however, the previous step setting up the auth.ts file does not include it in the export. This PR adds this export so users following won't get a 404 error when trying to login via the server.

🧢 Checklist

• [X] Documentation
• [X] Tests
• [X] Ready to be merged

🎫 Affected issues

Fixes: -->

📌 Resources

• Security guidelines
• Contributing guidelines
• Code of conduct
• Contributing to Open Source

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Name	Status	Preview	Comments	Updated (UTC)
auth-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 29, 2024 8:17pm

1 Ignored Deployment

| Name | Status | Preview | Comments | Updated (UTC) | | :--- | :----- | :------ | :------- | :------ | | **next-auth-docs** | ⬜️ Ignored ([Inspect](https://vercel.com/authjs/next-auth-docs/uq9FEaDwWHiaoxtxNEFz7gEkcCY3)) | [Visit Preview](https://next-auth-docs-git-fork-jordancalhoun-patch-2-authjs.vercel.app) | | Apr 29, 2024 8:17pm |

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