Update and rename 2.5.4.md to 2.6.0.md

Author: coredev-uk

1.client-releases/2.5.4.md renamed to 1.client-releases/2.6.0.md

@@ -1,11 +1,11 @@
 ---
 releaseNo: 23
-title: Cider Release 2.5.4
+title: Cider Release 2.6.0
 description: A codebase rewrite with a redone backend for Linux and macOS with fixes and improvements to Windows and the library that stands between it all.
 author: coredev-uk
 navigation.date: TBD
-navigation.headline: Cider 2.5.4
-image: 2.5.4.png
+navigation.headline: Cider 2.6.0
+image: 2.6.0.png
 draft: true
 tags:
   - Cider