Set vim as default editor

The nix build of mypy ^0.800 seems to have a memory leak and causes an OOM error

amanuensis.nix

@@ -13,9 +13,11 @@ in
   # Create a user for the server process to run under
   users.users.amanuensis = {
     isNormalUser = true;
+    group = "amanuensis";
     description = "Amanuensis server user";
     packages = [ python3-with-amanuensis-requires ];
   };
+  users.groups.amanuensis = {};
 
   # Create the server process systemd unit
   systemd.services.amanuensis = {

configuration.nix

@@ -9,7 +9,7 @@
     [ # Include the results of the hardware scan.
       ./hardware-configuration.nix
       ./amanuensis.nix
-      ./redstring.nix
+      #./redstring.nix
       ./catacomb.nix
       ./gitea.nix
     ];
@@ -23,6 +23,8 @@
   };
   boot.kernelParams = ["console=ttyS0"];
 
+  nix.package = pkgs.nixFlakes;
+
   networking.hostName = "empyrean";
 
   # The global useDHCP flag is deprecated, therefore explicitly set to false here.
@@ -51,6 +53,7 @@
     vim htop git tinc_pre python3
     gitea
   ];
+  environment.variables.EDITOR = "vim";
 
   services.nginx = {
     enable = true;
@@ -115,8 +118,10 @@
 
   users.users.tvb = {
     isNormalUser = true;
+    group = "tvb";
     extraGroups = [ "wheel" ]; # Enable ‘sudo’ for the user.
   };
+  users.groups.tvb = {};
 
   # This value determines the NixOS release from which the default
   # settings for stateful data, like file locations and database versions

redstring.nix

@@ -18,6 +18,7 @@ let
   redstringUser = {
     name = "redstring";
     description = "redstring service user";
+    group = "redstring";
     isSystemUser = true;
   };
 
@@ -71,6 +72,7 @@ let
 in
 {
   users.users.redstring = redstringUser;
+  users.groups.redstring = {};
 
   # Run the setup script on activation
   system.activationScripts.redstringSetup = "${redstringSetup}/bin/redstring-setup.sh";