nixpkgs/neovim: disable hlsearch

It's too noisy and we can still selectively turn it on if we actually
need it.

.config/nixpkgs/neovim/settings.lua

@@ -28,6 +28,9 @@ vim.o.breakindentopt = 'shift:2,sbr'
 -- show whitespace
 vim.o.list = true
 
+-- disable search highlight
+vim.o.hlsearch = false
+
 -- always show sign column to avoid layout shift when staging
 vim.o.signcolumn = 'yes'