Show 'About this version' for CivitAI models

[DenAbr]

Added an expander under the Model Description section to display the contents of the 'About this version' block from CivitAI. This block often includes useful information for this specific version.

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[DenAbr]

I have read the CLA Document and I hereby sign the CLA

[mohnjiles]

Sorry just getting around to the PRs 😅 thanks for this, looks good! Just one suggestion, could you possibly hide the version description if it doesn't have one? e.g.

IsVisible="{Binding SelectedModelVersion.VersionDescription, Converter={x:Static StringConverters.IsNotNullOrEmpty}}"

[DenAbr]

@mohnjiles Done, thanks for suggestion!