Update footer copyright to 2026 (#960)

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: stktung <132192+stktung@users.noreply.github.com>

Author: Copilot

docs/README.md

@@ -127,5 +127,5 @@ highlights:
         details: Manage your Kurrent installation with a graphical user interface
         link: /server/v25.0/features/admin-ui.html
 
-footer: Copyright © 2025 Kurrent, Inc
+footer: Copyright © 2026 Kurrent, Inc
 ---