Added the docking window to the sides

The button doesn't do anything currently. Once the entire layout is
finalized with all the options, we can finish that.
Revert "Added the docking window to the sides"

This reverts commit 9850ee7093e1000fd08e7cc4d4d52c88ec71b4d8.
Merge branch 'master' of https://github.com/mogonen/Shady-2.5D