Update contributing guide to reference aspire.dev for all documentation

[Copilot]

Closes #<ISSUE_NUMBER>

Updates the documentation contribution workflow to direct all documentation-related activities to the aspire.dev repository, removing references to the deprecated docs-aspire repository.

Changes Made

• Updated "Add or Improve Documentation" section in CONTRIBUTING.md
• All documentation activities (creating new docs, improving existing docs, and reporting issues) now point to microsoft/aspire.dev
• Removed reference to the deprecated dotnet/docs-aspire repository
• Consolidated instructions into a single clear statement for better readability

PR Checklist

• Created a feature/dev branch in your fork (vs. submitting directly from a commit on main)
• Based off latest main branch of toolkit
• PR doesn't include merge commits (always rebase on top of our main, if needed)
• New integration
  • Docs are written
  • Added description of major feature to project description for NuGet package (4000 total character limit, so don't push entire description over that)
• Tests for the changes have been added (for bug fixes / features) (if applicable)
• Contains NO breaking changes
• Every new API (including internal ones) has full XML docs
• Code follows all style conventions

Other information

Documentation-only change. No functional code changes. The deprecated docs-aspire repository reference has been removed per maintainer feedback to ensure contributors are directed to the correct location for all documentation work.

Original prompt

Can you update the contributing guide so that it says that when creating docs you need to raise an issue on https://github.com/microsoft/aspire.dev

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[aaronpowell]

@copilot this repo is deprecated, so we can remove references to it. All doc updates and changes need to be raised on https://github.com/microsoft/aspire.dev

[Copilot]

Removed the deprecated docs-aspire reference. All documentation updates, improvements, and issue reports now point to aspire.dev. (f5f2148)

[Copilot]

Pull request overview

This PR updates the CONTRIBUTING.md file to redirect all documentation contributions to the aspire.dev repository, replacing the previously referenced docs-aspire repository which is now deprecated.

Key Changes

• Updated the documentation URL from Microsoft Docs to aspire.dev
• Consolidated instructions for documentation contributions (creating, improving, or reporting issues) to point to the aspire.dev repository
• Removed reference to the deprecated dotnet/docs-aspire repository

[Copilot]

Remove the trailing space at the end of this line. This line ends with an unnecessary space after the period.

Suggested change

	The documentation for the Aspire Community Toolkit is available on [aspire.dev](https://aspire.dev).
	The documentation for the Aspire Community Toolkit is available on [aspire.dev](https://aspire.dev).