feat(nextjs): remove "--server=..." app generator option

[jaysoo]

Removes the server option for Next.js app generator, which was deprecated back in Nx 13.

Notes

• Users can use the @nrwl/next:custom-server generator or pass the --customServer flag to the app generator to generate the new setup.
• Removes the customServerPath executor option since it is no longer needed, and has been deprecated since Nx 13.
• Also removes the standaloneConfig from app/lib generator since it does nothing.

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Name	Status	Preview	Comments	Updated (UTC)
nx-dev	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 14, 2023 5:12pm

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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=4ed5cfce72d2708fe41e08b7db9a0d43864ee2dd --parallel=1
• nx affected --target=test --base=5da650abb10871dc96b9f3ef23eebaaa3145dc10 --head=4ed5cfce72d2708fe41e08b7db9a0d43864ee2dd --parallel=1
• nx run-many -t check-imports check-commit check-lock-files depcheck --parallel=1 --no-dte
• nx affected --target=build --base=5da650abb10871dc96b9f3ef23eebaaa3145dc10 --head=4ed5cfce72d2708fe41e08b7db9a0d43864ee2dd --parallel=3
• nx affected --target=lint --base=5da650abb10871dc96b9f3ef23eebaaa3145dc10 --head=4ed5cfce72d2708fe41e08b7db9a0d43864ee2dd --parallel=3
• nx-cloud record -- nx format:check --base=5da650abb10871dc96b9f3ef23eebaaa3145dc10 --head=4ed5cfce72d2708fe41e08b7db9a0d43864ee2dd
• nx documentation --no-dte

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