separated plugins configs and added couple new plugins

lua/custom/plugins/telescope-undo.lua

@@ -0,0 +1,34 @@
+return {
+  "debugloop/telescope-undo.nvim",
+  dependencies = { -- note how they're inverted to above example
+    {
+      "nvim-telescope/telescope.nvim",
+      dependencies = { "nvim-lua/plenary.nvim" },
+    },
+  },
+  keys = {
+    { -- lazy style key map
+      "<leader>u",
+      "<cmd>Telescope undo<cr>",
+      desc = "undo history",
+    },
+  },
+  opts = {
+    extensions = {
+      undo = {
+        side_by_side = true,
+        layout_strategy = "vertical",
+        layout_config = {
+          preview_height = 0.8,
+        },
+      },
+    },
+  },
+  config = function(_, opts)
+    -- Calling telescope's setup from multiple specs does not hurt, it will happily merge the
+    -- configs for us. We won't use data, as everything is in it's own namespace (telescope
+    -- defaults, as well as each extension).
+    require("telescope").setup(opts)
+    require("telescope").load_extension("undo")
+  end,
+}