Added info about factions and updated encounters

This is an update based on great feedback from ellohir that I agree with. The update adds more information and clarity about the motivations of the three factions involved - the birds, Paikea and his possum gang, and the Thieves Guild. To integrate them more closely, I updated the encounters and what happens at location #3 to focus on their activity and involvement more effectively.

I believe this will round out the adventure more and add higher stakes to the heist.

If you have already downloaded the adventure, then you will need to download the pamphlet (or the A4 sheets) again to get the updates. The items and maps remain the same.