vsx-extension: no buttons to see more information about the extension

[lmcbout]

Feature Description

As an enhancement, we should include additional information if available when displaying an extension's info (similarly to vscode):

• Details (Readme)
• Feature Contributions
• Changelog
• Dependencies

[vince-fugnitto]

@lmcbout it is not a bug, they were never present.
I updated the issue to reflect it is a feature enhancement to the existing vsx-editor.