Rewrite the install script reference

[adegeo]

Summary

• Added a new install script reference article that documents the install script like other CLI tools.
• Removed the install script include file.
• Updated sections that used the script include file to point to the install guide and the install reference.
• Updated the install guide to download the script instead of running it.
• Updated the install guide (as related to the script) with procedure format.

Fixes #4101

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Internal previews

📄 File	🔗 Preview link
docs/cli/install-script-reference.md	docs/cli/install-script-reference
docs/cli/install.md	docs/cli/install
docs/fundamentals/setup-tooling.md	docs/fundamentals/setup-tooling
docs/get-started/build-your-first-aspire-app.md	docs/get-started/build-your-first-aspire-app
docs/toc.yml	docs/toc
docs/whats-new/dotnet-aspire-9.4.md	docs/whats-new/dotnet-aspire-9.4

[Copilot]

Pull Request Overview

This PR restructures the documentation for installing the .NET Aspire CLI by replacing an include file with a dedicated reference article and updating the installation guide with procedural steps.

Key changes:

• Created a new install script reference article documenting the aspire-install scripts
• Removed the install script include file to consolidate documentation
• Updated the install guide to use step-by-step procedures instead of direct script execution

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
docs/whats-new/dotnet-aspire-9.4.md	Added reference links to install guide and script reference
docs/toc.yml	Added new install script reference article to table of contents
docs/includes/install-aspire-cli.md	Removed include file containing install script documentation
docs/get-started/build-your-first-aspire-app.md	Replaced include with references to CLI overview and install guide
docs/fundamentals/setup-tooling.md	Replaced include with references to CLI overview and install guide
docs/cli/install.md	Updated with procedural steps and reference to new script documentation
docs/cli/install-script-reference.md	New comprehensive reference for aspire-install scripts