Always use c-r as reverse history search in zsh

nix/base-system/.zshrc

@@ -2,5 +2,8 @@ set -o vi
 export PROMPT='%F{green}[%T] %F{cyan}(%n@%m) %F{lightgrey}(%y) %F{cyan} %~
 %F{white}%(!.>>.$>) '
 
+# Alwoys use C-R for history search backward
+bindkey '^R' history-incremental-search-backward
+
 # Opam configurattion
 [[ ! -r ~/.opam/opam-init/init.zsh ]] || source ~/.opam/opam-init/init.zsh  > /dev/null 2> /dev/null