zsh: Added .zshrc and moved oh-my-zsh

* Added .zshrc
* Moved oh-my-zsh/ inside zsh/

Signed-off-by: Joao Goncalves <jsvgoncalves@gmail.com>

zsh: removed oh-my-zsh folder

Signed-off-by: Joao Goncalves <jsvgoncalves@gmail.com>