Move nvim config into nvim/ subdirectory

Prepare repo structure for storing multiple dotfile configs.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

nvim/lua/plugins/lualine.lua

@@ -0,0 +1,19 @@
+return {
+  "nvim-lualine/lualine.nvim",
+  dependencies = { "nvim-tree/nvim-web-devicons" },
+  opts = {
+    options = {
+      theme = "auto",
+      component_separators = { left = "", right = "" },
+      section_separators = { left = "", right = "" },
+    },
+    sections = {
+      lualine_a = { "mode" },
+      lualine_b = { "branch", "diff", "diagnostics" },
+      lualine_c = { { "filename", path = 1 } },
+      lualine_x = { "encoding", "filetype" },
+      lualine_y = { "progress" },
+      lualine_z = { "location" },
+    },
+  },
+}