Bump Duende IdentityServer (and update template typos)

[maartenba]

Bump version numbers and update a few typos.

[Copilot]

Pull Request Overview

This PR updates the project from IdentityServer4 to Duende IdentityServer, bumping the version and correcting related documentation and UI text. The changes include updating package versions, fixing typos, and updating references to point to the correct Duende repositories and documentation.

• Bump Duende IdentityServer version from 7.1.1 to 7.3.0
• Update UI text and links to reference Duende instead of IdentityServer4
• Fix spelling error in logout confirmation message

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
Directory.Packages.props	Updates DuendeVersion from 7.1.1 to 7.3.0
src/Identity.API/Views/Home/Index.cshtml	Updates welcome message and links to reference Duende IdentityServer
src/Identity.API/Views/Account/Logout.cshtml	Fixes typo "logut" to "logout"
src/Identity.API/Configuration/Config.cs	Updates documentation URL to Duende's documentation

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}