Revert "Use fzf for searching zsh history"

This reverts commit 0bbd536e3e.

lib/shared/modules/atuin.nix

@@ -0,0 +1,6 @@
+{
+  programs.atuin = {
+    enable = true;
+    enableZshIntegration = true;
+  };
+}

lib/shared/modules/zsh.nix

@@ -300,7 +300,6 @@
           name = "plugin/vi-mode";
           tags = [ "from:oh-my-zsh" ];
         }
-        { name = "joshskidmore/zsh-fzf-history-search"; }
         { name = "zsh-users/zsh-completions"; }
         { name = "zsh-users/zsh-syntax-highlighting"; }
       ];