Upload desktop binaries as Github Release assets

[fmasa]

This PR fixes upload of desktop binaries and download page.

All the assets (binaries and metadata used by Conveyor) are uploaded to Github Release rather than to Github Pages and only the download page is now uploaded to Github Pages.

This is part of getting the desktop distribution to better shape:

• it now actually works again
• downloads from Releases seem to be faster than from Github Pages

[Copilot]

Pull Request Overview

This PR fixes the upload of desktop binaries by switching asset uploads from GitHub Pages to GitHub Releases and adjusting the download page deployment.

• Changed the Windows block in build configuration to update the upgrade UUID and remove the menu group setting.
• Updated the repository URL in the conveyor configuration and removed the site configuration block.
• Revised the GitHub Actions workflow to update action versions and streamline the packaging and deployment steps.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
desktop/build.gradle.kts	Updated UUID in the Windows block and removed the menu group setting.
conveyor.conf	Modified the vcs-url and removed the site configuration.
.github/workflows/desktop_distribution.yml	Upgraded action versions, restructured artifact handling, and changed environment settings.

Comments suppressed due to low confidence (1)

.github/workflows/desktop_distribution.yml:38

• The removal of the APP_VERSION environment variable might result in the build defaulting to '1.0.0', since it is used in build.gradle.kts. Please verify if this was intentional or consider reintroducing it with the proper value.

-      APP_VERSION: ${{ github.ref_name }}

[Copilot]

Pull Request Overview

This PR aims to fix the upload process for desktop binaries and the download page by moving binary and metadata uploads to GitHub Releases, which improves download speeds and reliability.

• Desktop installer configuration is updated (e.g., upgradeUuid change)
• The download page setup through workflow and configuration has been modified
• CI/CD workflow steps have been updated to newer actions versions and to separately handle asset uploads and Pages deployments

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
desktop/build.gradle.kts	Updated Windows installer configuration by changing upgradeUuid and removing unused menuGroup.
conveyor.conf	Removed the site block and modified vcs-url, which may affect URL resolution.
.github/workflows/desktop_distribution.yml	Upgraded action versions and restructured steps to properly upload artifacts and deploy the download page.

Comments suppressed due to low confidence (1)

conveyor.conf:18

• The vcs-url is missing the protocol (e.g., 'https://'). This may cause issues in systems expecting a fully qualified URL. Consider reverting to 'https://github.com/fmasa/wfrp-master' or ensuring that the URL is handled appropriately.

  vcs-url = "github.com/fmasa/wfrp-master"