docs-client-desktop: going out of maintenance

[DeepDiver1975]

owncloud/docs-client-desktop is being archived and will no longer be maintained. Please update the documentation to remove or deprecate its pages and references.

• Archived repo: https://github.com/owncloud/docs-client-desktop
• README archive notice: docs: mark repository as archived and unmaintained docs-client-desktop#774
• Config-side descope: owncloud/admin#239

Like the mobile client docs (#5144), this is a live Antora content source of this repo:

File	Lines	Reference
site.yml	31-36	docs-client-desktop.git content source — branches master, 7.1, 6.0, 5.3

Antora can still fetch from an archived repo, so the aggregated build will not break — but the desktop-client content is now frozen.

Unlanded content work discarded at archival

Worth recording, because these were approved and CI-green at close time — the diffs remain viewable on the closed PRs and can be re-applied to whatever supersedes this repo:

PR	Base	Page	Fix
#758 / #757	master / 7.1	using.adoc	Complete the folder three-dots menu
#754 / #753	master / 7.1	automatic_updater.adoc	Correct auto-update platform support
#746 / #745	master / 7.1	troubleshooting.adoc	Remove stale log-window keyboard shortcut
#744 / #743	master / 7.1	faq.adoc	Remove stale 100-subdirectories sync-depth FAQ
#734 / #733	master / 7.1	conflicts.adoc	Remove broken force-upload xref
#732 / #731	master / 7.1	installing.adoc	Correct -s command-line flag description

Also closed unaddressed: 16 issues, several of them substantive content requests from client maintainers — #538 (drop Suffix VFS), #537 (update WinVFS docs), #536 (local trash bin), #532 (Windows VFS-off behaviour), #584 (selective sync moved to a dialog), #597 (ctrl+L / F12 hotkeys removed in 6.0), #540 (Linux repo signing-key change), #551 (.url files on Linux), #519 (Linux VFS file not downloaded), #423 (macOS sync badges), #539 (data-size precision), #241 (cmake option to disable the auto updater), plus #728, #724, #723, #722.

Suggested follow-ups:

1. Decide whether the desktop component stays published at doc.owncloud.com from frozen content, or is removed from site.yml and redirected. If removed, add redirects for the indexed /client-desktop/ URLs.
2. If it stays, trim the per-version branch list — no new version branches will ever appear.
3. Re-apply the 12 approved fixes above wherever the desktop docs live next.
4. Related archivals: docs-ui (docs-ui: going out of maintenance #5143), docs-client-android + docs-client-ios-app (docs-client-android + docs-client-ios-app: going out of maintenance #5144).