Fix zsh impermanence

https://logs.nix.samueldr.com/nixos-chat/2020-06-07
Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

users/common/configs/zsh.nix

@@ -2,7 +2,10 @@
   programs.zsh = {
     enable = true;
     autocd = true;
-    history.expireDuplicatesFirst = true;
+    history = {
+      path = "$HOME/.local/share/zsh/history";
+      expireDuplicatesFirst = true;
+    };
     historySubstringSearch.enable = true;
     autosuggestion.enable = true;
     syntaxHighlighting.enable = true;

users/common/default.nix

@@ -72,10 +72,10 @@ in
           "VMs"
           "git"
           ".mozilla"
+          ".local/share/zsh"
         ];
         files = [
-          ".zsh_history"
-          ".key.txt"
+          ".local/share/sops-nix/key.txt"
         ];
         allowOther = true;
       };