patches: remove login page copyright footer in de-brand patch

The v1.5.0 de-brand patch now also strips the visible "Versity Software
Inc." copyright footer from the login page (webui/web/index.html). The
upstream copyright is still retained via the Apache-2.0 license-header
comment at the top of each file and the NOTICE file, so this removes the
trademark/branding without affecting copyright compliance.

Update the README to document the removal and adjust the "deliberately
kept" note.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

README.md

@@ -86,11 +86,14 @@ Currently maintained:
 - Browser tab titles → "S3 Gateway – …".
 - Removes the sidebar **Resources** section (external `github.com/versity` links).
 - Replaces the Versity favicon with a neutral SVG; deletes the Versity logo PNGs.
+- Removes the visible "© Versity Software Inc." footer from the login page.
 
 Deliberately **kept** (license compliance): the per-file Apache-2.0
-headers, the `NOTICE` file, and the "© Versity Software Inc." login
-footer. Upstream is Apache-2.0; these de-brand the *trademark*, not the
-copyright.
+license headers — which carry the upstream copyright notice as an HTML
+comment at the top of each file — and the `NOTICE` file. Upstream is
+Apache-2.0; the de-brand strips the visible Versity *trademarks* (logos,
+wordmarks, and the login footer) while preserving the *copyright* notice
+in the source headers.
 
 ## Adding / refreshing a version