templates: consistent templates, remove deprecated things

templates/clan/flake-parts/.envrc

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+# shellcheck shell=bash
+use flake

templates/clan/flake-parts/.gitignore

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+result*
+.direnv/

templates/clan/flake-parts/flake.nix

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+{
+  inputs.clan-core.url = "https://git.clan.lol/clan/clan-core/archive/main.tar.gz";
+  inputs.nixpkgs.follows = "clan-core/nixpkgs";
+  inputs.flake-parts.follows = "clan-core/flake-parts";
+  inputs.flake-parts.inputs.nixpkgs-lib.follows = "clan-core/nixpkgs";
+
+  outputs =
+    inputs@{ flake-parts, ... }:
+    flake-parts.lib.mkFlake { inherit inputs; } {
+      systems = [
+        "x86_64-linux"
+        "aarch64-linux"
+        "x86_64-darwin"
+        "aarch64-darwin"
+      ];
+      imports = [ inputs.clan-core.flakeModules.default ];
+      # https://docs.clan.lol/guides/flake-parts/
+      clan = {
+        # Ensure this is unique among all clans you want to use.
+        meta.name = "__CHANGE_ME__";
+
+        # Clan services to use. See https://docs.clan.lol/reference/clanServices
+        inventory.instances = {
+          admin = {
+            roles.default.tags.all = { };
+            roles.default.settings.allowedKeys = {
+              # Insert the public key of all your admin machines
+              # All these 'admin machines' will have ssh access to "tags.all" (all machines)
+              # Alternatively set 'users.users.root.openssh.authorizedKeys.keys' in each machine
+              "admin-machine-1" = "__YOUR_PUBLIC_KEY__";
+            };
+          };
+
+          zerotier = {
+            # Replace with the name of your machine that you will use as zerotier-controller
+            # See: https://docs.zerotier.com/controller/
+            # Deploy this machine first to create the network secrets
+            roles.controller.machines."__YOUR_CONTROLLER__" = { };
+            # Peers of the network
+            # tags.all means 'all machines' will joined
+            roles.peer.tags.all = { };
+          };
+        };
+
+        # A mapping of machine names to their nixos configuration.
+        # Allows specifying additional nixos configuration.
+        machines = {
+          somemachine =
+            { pkgs, ... }:
+            {
+              environment.systemPackages = with pkgs; [ asciinema ];
+            };
+        };
+      };
+      perSystem =
+        { pkgs, inputs', ... }:
+        {
+          devShells.default = pkgs.mkShell { packages = [ inputs'.clan-core.packages.clan-cli ]; };
+        };
+    };
+}