docs(nextjs): add a guide for configuring Next.js plugins

[jaysoo]

This PR adds a new guide for configuring Next.js plugins in Nx 15 (and prior) and Nx 16.

Preview: https://nx-dev-git-fork-jaysoo-docs-nextjs-config-nrwl.vercel.app/packages/next/documents/next-config-setup

Current Behavior

Expected Behavior

Related Issue(s)

Closes #16141

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
nx-dev	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 17, 2023 1:29pm

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✅ Successfully ran 8 targets

• nx affected -t e2e-macos --parallel=1 --exclude=e2e-detox
• nx affected --target=e2e --base=5da650abb10871dc96b9f3ef23eebaaa3145dc10 --head=f7e105b3aec4ab62dbd95f057a4b27a6728e1dd3 --parallel=1
• nx affected --target=build --base=5da650abb10871dc96b9f3ef23eebaaa3145dc10 --head=f7e105b3aec4ab62dbd95f057a4b27a6728e1dd3 --parallel=3
• nx run-many -t check-imports check-commit check-lock-files depcheck --parallel=1 --no-dte
• nx affected --target=test --base=5da650abb10871dc96b9f3ef23eebaaa3145dc10 --head=f7e105b3aec4ab62dbd95f057a4b27a6728e1dd3 --parallel=1
• nx affected --target=lint --base=5da650abb10871dc96b9f3ef23eebaaa3145dc10 --head=f7e105b3aec4ab62dbd95f057a4b27a6728e1dd3 --parallel=3
• nx-cloud record -- nx format:check --base=5da650abb10871dc96b9f3ef23eebaaa3145dc10 --head=f7e105b3aec4ab62dbd95f057a4b27a6728e1dd3
• nx documentation --no-dte

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[AgentEnder]

Generated docs stuff looks fine

[github-actions]

This pull request has already been merged/closed. If you experience issues related to these changes, please open a new issue referencing this pull request.