Update to use LazyVim default plugins

Remove NatDat
Update README to include fzf

lua/plugins/nvim-cmp.lua

@@ -1,15 +0,0 @@
-return {
-  {
-    "hrsh7th/nvim-cmp",
-    dependencies = {
-      "Gelio/cmp-natdat",
-      opts = {
-        cmp_kind_text = "NatDat",
-      },
-    },
-    opts = function(_, opts)
-      local cmp = require("cmp")
-      opts.sources = cmp.config.sources(vim.list_extend(opts.sources, { { name = "natdat" } }))
-    end,
-  },
-}