feat: nixvim config

currently only for dnsc-air. can simply be imported in other hosts

modules/nixvim/formatter.nix

@@ -0,0 +1,56 @@
+{ pkgs, ... }:
+
+{
+  plugins.conform-nvim = {
+    enable = true;
+    settings = {
+      formatters_by_ft = {
+        typescriptreact = {
+          __unkeyed-1 = "biome-check";
+          __unkeyed-2 = "prettierd";
+          stop_after_first = true;
+        };
+        astro = [ "prettierd" ];
+        typescript = {
+          __unkeyed-1 = "biome-check";
+          __unkeyed-2 = "prettierd";
+          stop_after_first = true;
+        };
+        javascript = {
+          __unkeyed-1 = "biome-check";
+          __unkeyed-2 = "prettierd";
+          stop_after_first = true;
+        };
+        javascriptreact = {
+          __unkeyed-1 = "biome-check";
+          __unkeyed-2 = "prettierd";
+          stop_after_first = true;
+        };
+        html = [ "prettierd" ];
+        htmlangular = [ "prettierd" ];
+        css = {
+          __unkeyed-1 = "biome-check";
+          __unkeyed-2 = "prettierd";
+          stop_after_first = true;
+        };
+        yaml = [ "prettierd" ];
+        markdown = [ "prettierd" ];
+        json = {
+          __unkeyed-1 = "biome-check";
+          __unkeyed-2 = "prettierd";
+          stop_after_first = true;
+        };
+        lua = [ "stylua" ];
+        go = [ "goimports" ];
+        gomod = [ "goimports" ];
+        gowork = [ "goimports" ];
+        gotmpl = [ "goimports" ];
+      };
+      format_on_save = {
+        timeout_ms = 500;
+        lsp_format = "fallback";
+      };
+    };
+    extraPackages = [pkgs.stylua];
+  };
+}