"What's new" improvements

[niels9001]

Summary of the Pull Request

This PR introduces the following changes:

• Removed the custom titlebars on the OOBE Window, and replaced it with the inbox WinUI TitleBar control.

New "What's new" experience following the VS Code release notes experience

• Created a new SCOOBE Windows that is a standalone window to better visualize release notes.
• Adding a nav menu on the left to easily switch between release notes, instead of a long page.
• Point releases are combined with the latest main release.. e.g. 0.96.1 is rendered above 0.96.0.
• The 'hero image' on main release notes will automatically be rendered at the top of the page.
• Improved markdown styling for better readability.
• Pull requests links can now be clicked.
• Upgraded CommunityToolkit.Labs.MarkdownTextblock to the latest version as it includes much needed bugfixes.

PR Checklist

• Closes: #xxx

• Communication: I've discussed this with core contributors already. If the work hasn't been agreed, this work might be rejected
• Tests: Added/updated and all pass
• Localization: All end-user-facing strings can be localized
• Dev docs: Added/updated
• New binaries: Added on the required places
  • JSON for signing for new binaries
  • WXS for installer for new binaries and localization folder
  • YML for CI pipeline for new test projects
  • YML for signed pipeline
• Documentation updated: If checked, please file a pull request on our docs repo and link it here: #xxx

Detailed Description of the Pull Request / Additional comments

Validation Steps Performed