docs: Use --location=global when installing Angular CLI

[azizur]

npm WARN config global --global, --local are deprecated. Use --location=global instead.

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• The commit message follows our guidelines: https://github.com/angular/angular/blob/main/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
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What is the current behavior?

Issue Number: N/A

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Does this PR introduce a breaking change?

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• No

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[jessicajaniuk]

@azizur Thanks for this PR. It looks like NPM erroneously deprecated the --global and --local flags for a bit. If you update npm to latest, you'll see these warnings go away. You can see the comment thread on the npm cli repo here: npm/cli#5228 (comment)

If you see any other issues, feel free to create new PRs. We welcome the contributions.

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