Move Nix files into a nix directory

Move everything from `config` to the root level.

nvim/plugin/dap.lua

@@ -0,0 +1,69 @@
+local dap = require "dap"
+local ui = require "dapui"
+
+dap.adapters.php = {
+  type = "executable",
+  command = "node",
+  args = { os.getenv "HOME" .. "/build/vscode-php-debug/out/phpDebug.js" },
+}
+
+dap.configurations.php = {
+  {
+    type = "php",
+    request = "launch",
+    name = "Listen for Xdebug",
+    port = 9003,
+    pathMappings = {
+      ["/app"] = "${workspaceFolder}",
+      ["/var/www/html"] = "${workspaceFolder}",
+    },
+  },
+}
+
+dap.listeners.after.event_initialized["ui_config"] = function()
+  ui.open()
+end
+
+dap.listeners.before.event_terminated["ui_config"] = function()
+  ui.close()
+end
+
+dap.listeners.before.event_exited["ui_config"] = function()
+  ui.close()
+end
+
+ui.setup {
+  layouts = {
+    {
+      elements = {
+        { id = "scopes", size = 0.25 },
+        "breakpoints",
+        "stacks",
+        "watches",
+      },
+      size = 40, -- 40 columns
+      position = "right",
+    },
+    {
+      elements = {
+        "repl",
+        "console",
+      },
+      size = 0.25, -- 25% of total lines
+      position = "bottom",
+    },
+  },
+}
+
+require("nvim-dap-virtual-text").setup {
+  commented = true,
+}
+
+vim.keymap.set("n", "<leader>b", dap.toggle_breakpoint)
+vim.keymap.set("n", "<leader>gb", dap.run_to_cursor)
+
+vim.keymap.set("n", "<F1>", dap.continue)
+vim.keymap.set("n", "<F2>", dap.step_into)
+vim.keymap.set("n", "<F3>", dap.step_over)
+vim.keymap.set("n", "<F4>", dap.step_out)
+vim.keymap.set("n", "<F5>", dap.step_back)