~/.xmonad: Remove tabbed layout.

.xmonad/xmonad.hs

import XMonad.Hooks.DynamicLog
import XMonad.Hooks.ManageDocks (manageDocks, avoidStruts)
import XMonad.Hooks.ManageHelpers
import XMonad.Layout.Tabbed (simpleTabbed)
import XMonad.Util.Run (spawnPipe)
import XMonad.Util.EZConfig (additionalKeys)
import System.IO (hPutStrLn)
                        composeOne [ isFullscreen -?> doFullFloat ]
                     ] <+> manageHook defaultConfig,
        -- Don't overwrite the section used by docks
        layoutHook = avoidStruts $ layoutHook defaultConfig ||| simpleTabbed,
        layoutHook = avoidStruts $ layoutHook defaultConfig,
        handleEventHook = evHook
     } `additionalKeys` [
        ((mod4Mask, xK_b), spawnHere "chromium --allow-file-access-from-files"),