Modify Pulumi instructions to use pulumi config instead of env vars.

[jkodroff]

Description

By pointing the user to use pulumi config instead of env vars, it demonstrates both stack config and Pulumi's encryption of secrets by default, which is one of its more compelling features.

Reviewer Notes

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Related Issue(s) / Ticket(s)

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Use Conventional Commits

Please help the maintainers by leveraging the following conventional commit
standards in your pull request title and commit messages.

Use chore

• for minor changes / additions / corrections to content.
• for minor changes / additions / corrections to images.
• for minor non-functional changes / additions to github actions, github templates, package or config updates, etc

git commit -m "chore: adjusting config and content"

Use fix

• for minor functional corrections to code.

git commit -m "fix: typo and prop error in the code of conduct"

Use feat

• for major functional changes or additions to code.

git commit -m "feat(media): creating a video landing page"

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[nr-opensource-bot]

🎉 This PR is included in version 1.96.4 🎉

The release is available on GitHub release

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