ATHZ-01 Directory Traversal Payloads

[ThunderSon]

What would you like to happen?
In ATHZ-01, Directory Traversal scenario, there is a lot chit chat and payloads that are possibly outdated, could be improved, etc.

I was going around for payloads for this test, and this section was fantastic:
https://github.com/swisskyrepo/PayloadsAllTheThings/tree/master/Directory%20Traversal

What do you think would be a nice way to merge things? Should we just reference the payloads, and give advice on how to use and where to identify such vulnerabilities? Would that be a good test scenario?

I looked over the current document. In my opinion we could cut the size of the examples i.e:

1. How do identify vulnerable endpoints ( we can keep it)
2. Mentions the most common examples ( ../../, External file)
   • Mention it can lead to other vulnerabilities
   • Add the link to PayloadAllTheThings
3. Mention encoding / fuzzing

I think there are also good resources on ways to fuzz/encode

If there are no other candidates (new joiners and so on) I would take it.

[ThunderSon]

Closed in #662