File Moved to Assets from Root

Moving screenshot.psd to assets/psd to contain all files unneeded by Wordpress and Genesis to the assets folder so this entire folder can be ignored in deployment to a Wordpress environment. This folder will only contain design and resource files (.psd, .ai, etc.) and files to compile (.scss, .haml, etc.).

Signed-off-by: hellocharlie <hellocharlie@gmail.com>