docs: document running the Aspire CLI via npm/npx (#1239)

* docs: document running the Aspire CLI via npm/npx

The Aspire CLI is now published to npm as @microsoft/aspire-cli, so users can run any command (for example, the standalone dashboard) with npx and no install. Document the npm package and npx usage on the CLI install page, the standalone dashboard guide, and the aspire dashboard run command reference.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Apply suggestions from code review

Co-authored-by: David Pine <david.pine@microsoft.com>

* Document npm CLI update command

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Remove npx-without-install section from install page

Address PR feedback: the 'Run with npx without installing' section used a dashboard-specific example, which is out of place on the general install page. The standalone dashboard and 'aspire dashboard run' reference pages still document npx usage where it's contextually relevant.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: David Pine <7679720+IEvangelist@users.noreply.github.com>
Co-authored-by: Adam Ratzman <adam@adamratzman.com>

Author: 3 people

src/frontend/src/content/docs/get-started/install-cli.mdx

@@ -82,8 +82,14 @@ npm install -g @microsoft/aspire-cli
 
 The same command works on Windows, macOS, and Linux (including musl-based distributions such as Alpine). npm selects the correct native binary for your operating system and architecture automatically.
 
+To update an npm-based install, run:
+
+```bash title="Update with npm"
+npm install -g @microsoft/aspire-cli@latest
+```
+
 :::note
-When you install from npm, the Aspire CLI routes self-updates through npm. Running `aspire update --self` prints the `npm install -g @microsoft/aspire-cli@latest` command to run rather than downloading a new binary directly. For more information, see [`aspire update`](/reference/cli/commands/aspire-update/).
+When you install from npm, the Aspire CLI routes self-updates through npm. Running `aspire update --self` prints the npm update command rather than downloading a new binary directly. For more information, see [`aspire update`](/reference/cli/commands/aspire-update/).
 :::
 
 </TabItem>
@@ -140,5 +146,6 @@ The `+{commitSHA}` suffix indicates the specific commit from which the Aspire CL
 ## See also
 
 - [aspire-install script reference](/reference/cli/install-script/)
+- [`@microsoft/aspire-cli` on npm](https://www.npmjs.com/package/@microsoft/aspire-cli) — run the CLI with `npm` or `npx`
 - [`aspire` command reference](/reference/cli/commands/aspire/)
 - [Aspire VS Code extension](/get-started/aspire-vscode-extension/) — install the CLI and use Aspire commands from within VS Code

src/frontend/src/content/docs/reference/cli/commands/aspire-dashboard-run.mdx

@@ -17,6 +17,14 @@ import Include from '@components/Include.astro';
 aspire dashboard run [options]
 ```
 
+:::tip[Run without installing]{icon="node"}
+If your [Node.js](https://nodejs.org/) version meets the [`@microsoft/aspire-cli` npm package requirements](https://www.npmjs.com/package/@microsoft/aspire-cli), you can start the dashboard without installing the CLI by running it through [npx](https://docs.npmjs.com/cli/commands/npx):
+
+```bash title="Run dashboard with npx"
+npx -y @microsoft/aspire-cli dashboard run
+```
+:::
+
 ## Description
 
 The `aspire dashboard run` command starts a standalone Aspire Dashboard instance. The dashboard receives OpenTelemetry data (logs, traces, and metrics) and provides a web-based UI for viewing telemetry.