feat(configurations)!: flatten down, introduce meta.nix

Flatten down directory structure:
- From: `./hosts/${configuration-type}/${system}/{configuration,deploy}.nix`
-   To: `./hosts/${configuration-type}/{meta,configuration}.nix`
Keep `system` and `deploy-rs` config in `meta.nix`
Update `flake.lock`

hosts/nixos/jeeves/home/jeeves.nix

@@ -0,0 +1,63 @@
+{ inputs, lib, pkgs, config, ... }:
+
+{
+  imports = [
+    inputs.wired.homeManagerModules.default
+  ];
+
+  home = {
+    username = "jeeves";
+    homeDirectory = "/home/jeeves";
+    stateVersion = "23.05";
+  };
+
+  # Let Home Manager install and manage itself.
+  programs.home-manager.enable = true;
+
+  home.packages = with pkgs; [
+    ## Core
+    # neovim
+    git
+    gnupg
+    pciutils # lspci
+    usbutils # lsusb
+
+    ## Shell
+    # zsh
+    # starship
+    # zoxide
+    ripgrep
+
+    ## Nix
+    direnv
+
+    ## Torrents
+    tremc
+
+    ## Rust
+    rustc
+    cargo
+    rust-analyzer
+    clang
+    openssl
+    pkg-config
+  ];
+
+  reo101 = {
+    shell = {
+      enable = true;
+      direnv = true;
+      zoxide = true;
+      shells = [
+        "zsh"
+        "nushell"
+      ];
+    };
+  };
+
+  home.file = {
+    ".config/nvim" = {
+      source = config.lib.file.mkOutOfStoreSymlink "${config.home.homeDirectory}/.local/src/reovim";
+    };
+  };
+}