Remove legacy HTML templates and API service configuration for contact management system

- Deleted base template (base.html) and all related contact templates (contact_detail.html, contact_form.html, contact_list.html, graph.html, need_list.html).
- Removed partial templates for managing contacts and needs (contact_table.html, manage_needs.html, manage_relationships.html, need_items.html).
- Eliminated contact API service configuration (contact_api.nix) from the NixOS setup.

systems/jeeves/services/contact_api.nix

@@ -1,43 +0,0 @@
-{
-  pkgs,
-  inputs,
-  ...
-}:
-{
-  networking.firewall.allowedTCPPorts = [
-    8069
-  ];
-  systemd.services.contact-api = {
-    description = "Contact Database API";
-    after = [
-      "postgresql.service"
-      "network.target"
-    ];
-    requires = [ "postgresql.service" ];
-    wantedBy = [ "multi-user.target" ];
-
-    environment = {
-      PYTHONPATH = "${inputs.self}";
-      POSTGRES_DB = "richie";
-      POSTGRES_HOST = "/run/postgresql";
-      POSTGRES_USER = "richie";
-      POSTGRES_PORT = "5432";
-    };
-
-    serviceConfig = {
-      Type = "simple";
-      ExecStart = "${pkgs.my_python}/bin/python -m python.api.main --host 192.168.90.40 --port 8069";
-      Restart = "on-failure";
-      RestartSec = "5s";
-      StandardOutput = "journal";
-      StandardError = "journal";
-      NoNewPrivileges = true;
-      ProtectSystem = "strict";
-      ProtectHome = "read-only";
-      PrivateTmp = true;
-      ReadOnlyPaths = [
-        "${inputs.self}"
-      ];
-    };
-  };
-}