fix(kitty): use mono font variant

This was a nightmare to get working again as the font needed to be
patched as it had been depending on some kitty trickery where the actual
patched font wasn't used but the icons for the other fonts was used
instead.

So I had to get the font patcher fork from ryanoasis/nerd-fonts/issues/268
and patch it remembering to pass the --mono flag

.config/kitty/kitty.conf

@@ -8,7 +8,7 @@
 # kitty list-fonts
 # The default values shown below rely on your OS to choose an appropriate monospace font family.
 font_family      Fira Code Retina Nerd Font Complete Mono
-italic_font      Operator Mono Book Italic Nerd Font Complete
+italic_font      Operator Mono Book Italic Nerd Font Complete Mono
 bold_font        Operator Mono Bold Nerd Font Complete
 bold_italic_font Operator Mono Bold Italic Nerd Font Complete