refactor: cleanup and extract user config

modules/users/ergon.nix

@@ -0,0 +1,31 @@
+{
+  ...
+}:
+{
+  meta.lib.accounts.ergon = {
+    realName = "Jelle Spreeuwenberg";
+    emails = {
+      personal = {
+        address = "mail@jelles.net";
+        scope = "personal";
+        type = "mxrouting";
+      };
+      work = {
+        address = "jelle.spreeuwenberg@yookr.org";
+        primary = true;
+        scope = "work";
+        type = "office365";
+      };
+    };
+    sourceControl.projectScope = "work";
+  };
+
+  flake.modules.homeManager.ergon-workstation =
+    { pkgs, ... }:
+    {
+      home.packages = [
+        pkgs.rustup
+        pkgs.usql
+      ];
+    };
+}