feat: add bullets.vim for improved list handling

.config/nvim/lua/plugins/bullets.lua

@@ -0,0 +1,7 @@
+return {
+   'bullets-vim/bullets.vim',
+   ft = { 'markdown', 'text', 'gitcommit' },
+   config = function()
+      vim.g.bullets_delete_last_bullet_if_empty = 2
+   end,
+}