Update documentation to rename 'Changelog' to 'Release Notes' and add…

[scottolsonjr]

… release notes link

[Copilot]

Pull request overview

Updates the documentation site to present “Release Notes” instead of “Changelog”, add an explicit GitHub Releases link, and refresh the Docusaurus/tooling dependencies.

Changes:

• Renamed the sidebar entry from “Changelog” to “Release Notes” and updated the changelog page into a Release Notes landing page.
• Added a “Release Notes” link in the site footer pointing to GitHub Releases.
• Upgraded Docusaurus and related dependencies, and raised the declared Node.js engine requirement.

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated 3 comments.

File	Description
sidebars.js	Renames the sidebar label to “Release Notes”.
package.json	Upgrades Docusaurus/React-related dependencies, adds overrides, and bumps the Node engine requirement.
docusaurus.config.js	Moves broken-markdown-link handling into markdown.hooks and adds a footer link to GitHub Releases.
docs/dotnet/changelog/README.md	Replaces the detailed changelog content with a Release Notes page that points to GitHub Releases and NuGet.

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[Copilot]

Pull request overview

Copilot reviewed 6 out of 7 changed files in this pull request and generated 3 comments.