Add IppSec to the list

Hello,

I would like to suggest adding IppSec to the list.. or well he youtube channel at least.
He create easy to follow walkthroughs of every HTB Box when they retire.

His website: https://ippsec.rocks/
It's an index of all his videos, searchable by Box Name, tools used, techniques, protocols, etc.

And his youtube channel: https://www.youtube.com/channel/UCa6eh7gCkpPo5XXUDfygQQA

Could fit well under Tutorials, Websites or Writeups Collections

Locate the list sections suggested in the issue—Tutorials, Websites, or Writeups Collections—and review their existing entry format. Add IppSec's website and YouTube channel in the best-fitting section, preserving the list's conventions; done means both links are included and rendered consistently.

Written by the indexing model from the issue text.