[DOCUMENTATION] Documentation page for hashing is outdated

[Onako2]

The documentation page located at docs/first-run/hashing.md contains a link that doesn't work anymore(http://ww1.pogodev.org/d/55-api-hashing-service-f-a-q)

Expected Behavior

The FAQ should be linked

Current Behavior

Dead link

Possible Solution

Create your own documentation page

Context

Just go on the documentation page here