Replace undotree plugin by the built-in functionality

Author: ofseed

lua/keymaps.lua

@@ -87,3 +87,5 @@ vim.keymap.set('n', ']b', bnext, { desc = 'Next buffer' })
 vim.keymap.set('n', '[b', bprevious, { desc = 'Prev buffer' })
 
 vim.keymap.set('n', '<leader>ll', vim.diagnostic.setloclist, { desc = 'Diagnostic list' })
+
+vim.keymap.set('n', '<leader>u', '<Cmd>Undotree<CR>', { desc = 'Undo Tree' })

lua/misc.lua

@@ -1,5 +1,8 @@
 local custom = require 'custom'
 
+-- Enable the build-in undotree plugin.
+vim.cmd.packadd 'nvim.undotree'
+
 -- Remove help information from the popup menu.
 vim.cmd.aunmenu [[PopUp.How-to\ disable\ mouse]]
 vim.cmd.aunmenu [[PopUp.-1-]]