One effect implemented and applied

Small changes :
Effects are a collection (maybe replace price for competence as an
effect to adapt the way to pay for each skill...)
One effect (goatProductivity) is vaguely implemented and connected.
added table for player infos

To better visualize and for incoming changes
Added some css to make it uglier

^^
added avalibility on buying skills

class : avalaible, not-avalaible
onclick : if !CanBuy => nothing
colors : as ugly as can be