Update and rename Part V: The Border Layout.md to Part V: Layouts.md

Fair enough. Then could Max replace `https://github.com/BillsJ/cadmus/raw/master/src/Images/border_layout.png` to `https://github.com/HashanP/cadmus/raw/master/src/Images/border_layout.png`, i.e. replace `BillsJ` with `HashanP`, and do the same with the other one.