Add gui for playing a story and add the playing mechanics

Is your feature related to a problem? Please describe.

Add a pages for starting to play a story and pages for actually playing it according to the criteria. Follow the figma design. It should be possible to create new goals for a story and set the difficulty before playing the game. When a game is done, it should be possible to replay it with new goals and a different difficulty or go to the main menu.

Describe the solution you'd like.

It should be mandatory to have at least one goal for a story. When playing should player statistics like health, score, gold and inventory be displayed as well as which goals have been fulfilled.