Revamp About window for open-source project messaging

[alex-bochkov]

Motivation

• Make the About window present the project as a proper open-source effort with a professional, contribution-friendly narrative.
• Surface canonical GitHub entry points (repository, issues, discussions, wiki, releases, license) so users can report issues and contribute.
• Display license and support expectations clearly and include a no-warranty statement appropriate for community-maintained tooling.
• Improve layout and readability so the information fits comfortably in the tool window and is easier to navigate.

Description

• Reworked the About UI in AxialSqlTools/WindowAbout/AboutWindowControl.xaml from a compact single-column view into a scrollable, card-style grid with clearer sections for project description, links, license, and contributing guidance.
• Added explicit GitHub links for repository, issues, discussions, wiki, releases, and the license, and added supporting text describing community-based support and contribution expectations.
• Updated text and styling and moved the runtime label to SSMS extension version {version} in AxialSqlTools/WindowAbout/AboutWindowControl.xaml.cs.
• Consolidated external link navigation into a single handler Hyperlink_RequestNavigate and kept the diagnostic log folder link and behavior unchanged.

Testing

• Ran a quick XAML parse check with python3 and xml.etree.ElementTree on AxialSqlTools/WindowAbout/AboutWindowControl.xaml, which succeeded.
• Ran git diff --check to verify no whitespace/merge markers, which reported clean results.
• Attempted .NET toolchain validation (dotnet, msbuild, xbuild) but the Linux container does not have those tools installed so a full build/VSIX validation was not executed.

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Codex Task