Use jdhao/better-escape.vim to handle jk as escape mappings

only for insert mode ( so also works on terminal too )

remove visual mode key binding, till we find a proper solution, because it is super annoying right now

Original pr here: https://github.com/siduck76/NvChad/pull/160

lua/mappings.lua

@@ -18,11 +18,6 @@ map("v", "x", [=[ "_x ]=], opt)
  this line too ]]
 --
 
--- escape with 'jk' mapping
-vim.api.nvim_set_keymap("i", "jk", "<esc>", {})
-vim.api.nvim_set_keymap("v", "jk", "<esc>", {})
-vim.api.nvim_set_keymap("t", "jk", "<esc>", {})
-
 -- Don't copy the replaced text after pasting in visual mode
 map("v", "p", '"_dP', opt)