fix(modules/programs/nixvim/plugins/codeium-vim): directory unavailable

Create the directory prior to symlinking to avoid the following error:

> ln: failed to create symbolic link
> '/home/naho/.local/share/.codeium/config.json': No such file or
> directory

Follows: c4ded96

modules/programs/nixvim/plugins/codeium-vim/default.nix

@@ -6,13 +6,18 @@
   # TODO: Replace the activation script with an upstream VIM plugin option for
   # setting the config path storing the API key, similar to the 'config_path'
   # option in https://github.com/Exafunction/codeium.nvim.
-  home.activation.codeiumVim = lib.hm.dag.entryAfter ["writeBoundary"] ''
-    ln \
-      --force \
-      --symbolic \
-      ${config.age.secrets.modulesProgramsNixvimPluginsCodeium.path} \
-      "${config.xdg.dataHome}/.codeium/config.json"
-  '';
+  home.activation.codeiumVim = let
+    directory = "${config.xdg.dataHome}/.codeium";
+  in
+    lib.hm.dag.entryAfter ["writeBoundary"] ''
+      mkdir --parents "${directory}"
+
+      ln \
+        --force \
+        --symbolic \
+        ${config.age.secrets.modulesProgramsNixvimPluginsCodeium.path} \
+        "${directory}/config.json"
+    '';
 
   programs.nixvim.plugins.codeium-vim.enable = true;
 }