fix: fix production builds

[richardlau]

Move cross-env from devDependencies to dependencies to fix production deployment.

Description

According to https://nodejs.org/github-webhook.log, production builds of the website are broken:

stderr: npm WARN config cache-min This option has been deprecated in favor of `--prefer-offline`.
stderr: npm WARN config production Use `--omit=dev` instead.
stderr: npm http fetch POST 200 https://registry.npmjs.org/-/npm/v1/security/advisories/bulk 6765ms
stdout: 
stdout: added 576 packages, and audited 577 packages in 34s
stdout: 
stdout: 170 packages are looking for funding
stdout:   run `npm fund` for details
stdout: 
stdout: found 0 vulnerabilities
stdout: 
stdout: > nodejs.org@1.0.0 deploy
stdout: > npm run build && npm run export
stdout: 
stdout: 
stdout: > nodejs.org@1.0.0 build
stdout: > cross-env NODE_ENV=production NODE_NO_WARNINGS=1 next build
stdout: 
stderr: sh: 1: cross-env: not found

The production deployment is via a Docker container created by this script which installs via:

npm install --cache-min 1440 --production

which means devDependencies are not installed.

Related Issues

Check List

• I have read the Contributing Guidelines and made commit messages that follow the guideline.
• I have run npx turbo lint to ensure the code follows the style guide. And run npx turbo lint:fix to fix the style errors if necessary.
• I have run npx turbo format to ensure the code follows the style guide.
• I have run npx turbo test to check if all tests are passing, and/or npx turbo test:snapshot to update snapshots if I created and/or updated React Components.
• I've covered new added functionality with unit tests if necessary.

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Name	Status	Preview	Comments	Updated (UTC)
nodejs-org	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 16, 2023 5:35pm
nodejs-org-stories	✅ Ready (Inspect)	Visit Preview		May 16, 2023 5:35pm

[ovflowd]

LGTM! Let's get this merged ASAP