X.D.Extending: Remove keyAddDel and logHook
X.D.Extending: Remove keyAddDel and logHook

+ $keyAddDel can just be a side note in $keyDel, it does not need its
  own section.

+ $logHook is covered in more detail in the tutorial and does not serve
  a real purpose anymore.  One could rewrite it to be more in-depth
  about the inner workings of X.H.StatusBar, but for the time removing
  it seems like the best option.

Closes: https://github.com/xmonad/xmonad-contrib/issues/645

xmonad/xmonad-contrib,xmonad/xmonad-contrib