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Pull request overview

This pull request adds comprehensive "What's New" documentation for Aspire versions 9.0 through 9.5, organizing them under a new "Previous versions" section in the sidebar. The PR reorganizes the documentation structure to highlight the latest versions (13.1 and 13.0) while making older version documentation easily accessible.

Key changes:

• Addition of six new documentation files covering Aspire 9.0-9.5 release notes
• Sidebar restructuring to group older versions under a collapsible "Previous versions" section
• Image asset organization improvements with proper directory structure

Reviewed changes

Copilot reviewed 11 out of 77 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
aspire-9.mdx	Complete documentation for Aspire 9.0 major release (695 lines)
aspire-9-5.mdx	Documentation for Aspire 9.5 minor release (1149 lines)
aspire-9-4.mdx	Documentation for Aspire 9.4 minor release (1893 lines)
aspire-9-3.mdx	Documentation for Aspire 9.3 minor release (971 lines)
aspire-9-2.mdx	Documentation for Aspire 9.2 minor release (523 lines)
aspire-9-1.mdx	Documentation for Aspire 9.1 minor release (341 lines)
docs.topics.ts	Sidebar configuration with new "Previous versions" grouping
persistent-containers.mdx	Updated import paths for moved assets
ja/whats-new/aspire-13.mdx	Added missing anchor span
ja/whats-new/aspire-13-1.mdx	Fixed anchor span ID encoding
package.json	Added linkcheck script
dashboard-metrics-warning.png	New binary image asset

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