fix(docs): Update D1 adapter configuration code

[krismartin]

• Fix the code examples for configuring D1 adapter in different frameworks
• Remove code example for express as running express app in Cloudflare Workers is not currently supported

☕️ Reasoning

The code examples in the documentation page for configuring D1 adapter don't work

🧢 Checklist

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

🎫 Affected issues

Fixes: https://github.com/nextauthjs/next-auth/issues/12044

📌 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	Nov 1, 2024 1:43am

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| Name | Status | Preview | Comments | Updated (UTC) | | :--- | :----- | :------ | :------- | :------ | | **next-auth-docs** | ⬜️ Ignored ([Inspect](https://vercel.com/authjs/next-auth-docs/8qhrBgG6E4cwoNiTBxEmmYwAfk9f)) | [Visit Preview](https://next-auth-docs-git-fork-krismartin-docs-update-d1-ea86c4-authjs.vercel.app) | | Nov 1, 2024 1:43am |

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