Update standalone dashboard docs for Aspire CLI

[davidfowl]

The standalone dashboard docs still emphasized the container-image workflow in several entry points, which made the new aspire dashboard run path less discoverable. This updates the docs to recommend installing the Aspire CLI for the primary standalone workflow while preserving the container image as the second supported way to run the dashboard.

Summary

• Make /dashboard/standalone/ the source of truth for starting the standalone dashboard.
• Document both supported startup paths there: Aspire CLI and standalone container image.
• Trim repeated startup commands from the dashboard landing, overview, Python, and Node.js pages and link them back to the standalone guide.
• Keep the language guides focused on app telemetry setup instead of repeating dashboard startup details.

Validation

• Validated the affected pages against the running local Aspire app.
• Confirmed only /dashboard/standalone/ contains the aspire dashboard run and docker run --rm examples.
• Confirmed the other affected pages link back to the standalone guide.
• Ran git diff --check.

[Copilot]

Pull request overview

Updates the Aspire Dashboard documentation to make /dashboard/standalone/ the primary “source of truth” for running the dashboard standalone, emphasizing the aspire dashboard run workflow while keeping the container image as an alternative path.

Changes:

• Reworked the standalone dashboard guide to present two supported startup options (Aspire CLI first, container image second) and adjusted related login/auth guidance.
• Removed repeated Docker startup command blocks from the dashboard landing/overview and language-specific guides, replacing them with links back to the standalone guide.
• Updated language guides (Python, Node.js) to focus on telemetry setup rather than duplicating dashboard startup instructions.

Show a summary per file

File	Description
src/frontend/src/content/docs/dashboard/standalone.mdx	Repositions the page as the canonical standalone startup guide, documenting CLI + container image workflows.
src/frontend/src/content/docs/dashboard/standalone-for-python.mdx	Removes embedded Docker startup instructions and links to the standalone guide instead.
src/frontend/src/content/docs/dashboard/standalone-for-nodejs.mdx	Removes embedded Docker startup instructions and links to the standalone guide instead; trims unused imports.
src/frontend/src/content/docs/dashboard/overview.mdx	Collapses standalone section to a short description linking to the standalone guide; removes Docker command block.
src/frontend/src/content/docs/dashboard/index.mdx	Collapses standalone run section to a short description linking to the standalone guide; removes Docker command block and updates capability text.

Copilot's findings

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Comments suppressed due to low confidence (1)

src/frontend/src/content/docs/dashboard/standalone-for-python.mdx:231

• The shutdown instruction assumes the dashboard is running in the foreground (Ctrl+C), which is true for aspire dashboard run but not for the container-image workflow (the standalone guide runs the container detached). Please split the instruction by startup method (e.g., Ctrl+C for CLI, docker stop aspire-dashboard for container) so readers can reliably stop the dashboard.

<Steps>

1. Stop the FastAPI application by pressing <Kbd windows='Ctrl+C' mac='⌘+C' /> in the terminal where it's running.
2. Stop the Aspire dashboard by pressing <Kbd windows='Ctrl+C' mac='⌘+C' /> in the terminal where the dashboard is running.

• Files reviewed: 5/5 changed files
• Comments generated: 1

[IEvangelist]

LGTM, thank you!