Vim window movement | vim window moving
snatched from https://stackoverflow.com/a/4571319
:help window-moving
C-w R - To rotate windows up/left.
C-w r - To rotate windows down/right.
C-w L - Move the current window to the "far right"
C-w H - Move the current window to the "far left"
C-w J - Move the current window to the "very bottom"
C-w K - Move the current window to the "very top"