docs: document running the Aspire CLI via npm/npx

[IEvangelist]

Summary

The Aspire CLI is now published to npm as @microsoft/aspire-cli. With Node.js installed, users can run any Aspire command (for example, the standalone dashboard) directly with npx and no separate install:

npx -y @microsoft/aspire-cli dashboard run

This PR documents the npm package and npx usage across the install and dashboard docs.

Changes

• get-started/install-cli.mdx — adds a Use the npm package section covering zero-install npx usage and the npm install -g alternative, plus a See also link to the npm package.
• dashboard/standalone.mdx — adds a Run without installing tip under the Aspire CLI startup option with the npx command. (The Node.js and Python standalone tutorials delegate here, so they pick it up automatically.)
• reference/cli/commands/aspire-dashboard-run.mdx — adds the same npx tip after the synopsis.

All commands are cross-platform, so plain titled code blocks are used rather than OS-aware tabs. No Aspire version is referenced since this capability has shipped.

[Copilot]

Pull request overview

Documents using the new @microsoft/aspire-cli npm package to run Aspire CLI commands via npx, specifically highlighting “run without installing” scenarios for the standalone dashboard and CLI reference.

Changes:

• Add an Use the npm package section to the CLI install guide, including npx and npm install -g flows.
• Add a Run without installing tip to the standalone dashboard page.
• Add the same Run without installing tip to the aspire dashboard run command reference.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
src/frontend/src/content/docs/get-started/install-cli.mdx	Adds npm/npx installation and usage guidance plus a “See also” link to npm.
src/frontend/src/content/docs/dashboard/standalone.mdx	Adds an npx-based “run without installing” tip to the CLI startup path.
src/frontend/src/content/docs/reference/cli/commands/aspire-dashboard-run.mdx	Adds an npx-based “run without installing” tip after the synopsis.

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[aspire-repo-bot]

Frontend HTML artifact ready

The latest frontend build uploaded the frontend-dist artifact for PR #1239. Use the VS Code button below to open this PR with GitHub Artifacts Explorer and browse the built HTML locally.

This comment updates automatically when a new frontend build artifact is uploaded.

[davidfowl]

#1243 😄

[davidfowl]

I'm not sure this makes sense to show here as its about running with the standalone dashboard.