Fix the environment's output observation order in documentation

[LJArendse]

Overview

This pull request aims to fix env observation dict ordering explained in the repo README.md

Upon further investigation I have picked up an error in the environment's output observation explanation.

The correct ordering and index explanation for the observation list is:

• "MONSTER"
• "TREASURE"
• "TREASURE_SAFELY"
• "PORTION"
• "PORTION_SAFELY"
• "EXIT"
• "EXIT_SAFELY"
• "HP" This ordering is defined in the definition.py file.

Changes made

• Update env observation explaination (see commit 9eb19485838e8de85cb3ba38a2316dc356797596)
• Update The MiniDungeons Gym Environment Overview diagram (see commit d6561b690068aa8de3a22ff31d6d325aa4e4ca65 )

[ganyariya]

Thank you ! I'll merge!

[LJArendse]

Thanks for merging :+1: :1st_place_medal: