feat: Add nvchad module and enable nvchad instead of nixvim

nvchad/lua/configs/conform.lua

@@ -0,0 +1,18 @@
+local options = {
+  formatters_by_ft = {
+    lua = { "stylua" },
+    -- css = { "prettier" },
+    -- html = { "prettier" },
+    nix = {
+      "nixfmt",
+      lsp_format = "fallback",
+    },
+  },
+  format_on_save = {
+    -- These options will be passed to conform.format()
+    timeout_ms = 500,
+    lsp_fallback = true,
+  },
+}
+
+return options