refactor(after-plugins): Divide defaults.lua into two files

Divide defaults.lua into two files, settings.lua and lualine-config.lua

after/plugin/settings.lua

@@ -0,0 +1,7 @@
+vim.opt.tabstop = 2
+vim.opt.shiftwidth = 2
+vim.opt.expandtab = true
+vim.bo.softtabstop = 2
+vim.opt.relativenumber = true
+vim.keymap.set('t', '<Esc>', [[<C-\><C-n>]], { noremap = true }) -- Set keymap to exit terminal using 'exit'
+vim.cmd.colorscheme 'rose-pine-main'                             -- Set custom colorscheme [[ NOTE: Never set it to "onedark" cuz it breaks the editor ]]