[student guide ] Create student guide for running Post Mortems

[tylerauerbeck]

📝 Description

Based off of the problems introduced during the deployment and incident management modules, we will look to run a postmortem to learn what we can from the problems that were encountered. So that the student understands what we are doing, we need to create a student guide to walk them through this exercise

✅ A/Cs

• Create user documentation that introduces the idea of postmortem discussions and their purpose
• Create exercise steps to walk through creating a postmortem template and highlight the importance of the pieces of information you should look to gain from it.