theme: zathura takes the YoRHa palette

A local zathura/yorha replaces the catppuccin include. Pages are
recoloured onto the hull with bone text while images keep their
colours, the index and completion select with the light slab, and
search hits use a bone wash with the current hit in sand.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

zathura/zathurarc

@@ -1,4 +1,3 @@
-include catppuccin-mocha
+include yorha
 
 set adjust-open width
-