fix(nextjs): set correct distDir when running production server through Nx

[jaysoo]

This PR fixes an issue where nx serve <app> --prod is broken because distDir is pointing to the wrong directory. If we're running from Nx, the distDir must be read in from project configuration. Otherwise, default to .next for isolated deployments outside of the workspace.

Current Behavior

Expected Behavior

Related Issue(s)

Fixes #

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1 Ignored Deployment

Name	Status	Preview	Comments	Updated
nx-dev	⬜️ Ignored (Inspect)			Mar 23, 2023 at 4:28PM (UTC)

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✅ Successfully ran 8 targets

• nx run-many -t e2e-macos --parallel=1 --exclude=e2e-detox
• nx affected --target=e2e --base=7a48214438935547a36dacd9be6e410e2b510252 --head=d22c5e1f50925e03a52e032bf35947c75783d30e --parallel=1
• nx run-many -t root-lint check-imports check-commit check-lock-files depcheck --parallel=1 --no-dte
• nx affected --target=lint --base=7a48214438935547a36dacd9be6e410e2b510252 --head=d22c5e1f50925e03a52e032bf35947c75783d30e --parallel=3
• nx affected --target=build --base=7a48214438935547a36dacd9be6e410e2b510252 --head=d22c5e1f50925e03a52e032bf35947c75783d30e --parallel=3
• nx affected --target=test --base=7a48214438935547a36dacd9be6e410e2b510252 --head=d22c5e1f50925e03a52e032bf35947c75783d30e --parallel=1
• nx-cloud record -- nx format:check --base=7a48214438935547a36dacd9be6e410e2b510252 --head=d22c5e1f50925e03a52e032bf35947c75783d30e
• nx documentation --no-dte

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