[nix] Split up program configs into files

Co-Authored-By: Winter <winter@winter.cafe>

nix/hosts/alymac/nvim.nix

@@ -0,0 +1,27 @@
+{ dotfiles, ... }:
+
+{
+  programs.neovim = {
+    enable = true;
+    package = pkgs.neovim-unwrapped;
+
+    extraConfig = "source ${dotfiles}/nvim/init.vim";
+
+    coc = {
+      enable = true;
+
+      settings = {
+        languageServer = {
+          nix = {
+            command = "rnix-lsp";
+            filetypes = [ "nix" ];
+          };
+          "go.goPlsOptions" = {
+            completion = true;
+            completeUnimported = true;
+          };
+        };
+      };
+    };
+  };
+}