Revert "Start tmux dashboard using zsh, not sh."

This reverts commit 223b94657ff2e34d812aac79932a5e1544601490.
Updated readme.
xmobarrc. Tweaks for desktop:

  * Added widgets for weather, volume & mpd.
  * Changed color of widget name for volume, weather & mpd.
Updated tmux-dashboard for desktop:

 * renamed window mplayer -> media.
 * show log of Xorg instead of daemon.
XMonad.hs: add mpv to list of floating clients.
Added config for rtorrent + hotkeys in xmonad.
Xinitrc: start leechcraft.
Add simple commands for converting audio files.
Use collectiongain for calculating replaygain
add alac2ogg function.
Do not calculate replaygain after alac2ogg.
Do not set -e in functions.
Rewrite audio_jobs using GNU Parallel.
Add functions for quick conversion FLAC to MP3s.
Add function to optimise all PNGs recursively in parallel.
Migrate rtorrent config to newer version.
Fix handling special symbols.
Monitor daemon.log in dashboard