Reorganize the introduction

[FranciscoSMM]

Delete the first City image and rewrite the text to better fit an introductory thing. Do not forget to talk about the usage of dice and some basic terms of the game. Basically Review the introduction.

• [x] Dice
• [x] Terms the game uses
• [x] What is this game about
• [x] Number of people who to play
• [x] Lore
• [x] What are personas