rename main.html -> index.html
initial view

- container elements for scene and Ryu
- Ryu poses set in css
add hadouken sprite

- preview `.ryu-throwing` pose
- position the fireball correctly
hover to ready up Ryu

- mouse enter: Ryu enters ready pose
- mouse leave: Ryu returns to still pose
- combine Ryu div elements (toggle classes on single div)