Add HTB Writeups to Awesome Repositories

[momenbasel]

Summary

• Adds HTB Writeups to the Awesome Repositories table in alphabetical order
• The repository is a comprehensive Hack The Box writeup collection covering 500+ machines, 400+ challenges, ProLabs, Sherlocks (DFIR), CTF events, cheatsheets, and certification prep guides (OSCP/CPTS/CRTO)
• Entry placed between "Hacking Resources" and "Honeypots" to maintain alphabetical order

Checklist

• Entry added to README.md
• Alphabetical order maintained
• Format matches existing entries (Repository | Description table)
• Link is valid and repository is public

[Copilot]

Pull request overview

Adds an HTB Writeups entry to the “Awesome Repositories” table in README.md, expanding the curated list with a Hack The Box-focused writeup collection while keeping the list alphabetized.

Changes:

• Added the “HTB Writeups” repository link and description to the Awesome Repositories table.
• Inserted the entry between “Hacking Resources” and “Honeypots” to maintain alphabetical order.

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