Amend advanced server security section

Content request

✏ Suggest ideas for new content!

Checklist

• This issue is not a duplicate, I've searched the Issue Tracker
• This issue is not a question, I'm aware that I can submit questions via Mastodon, Twitter, Email, Reddit or Matrix
• This issue is a content request, and not a bug report, feature request, or anything other

What are you missing or what could be improved?

Provide instructions on how to further increase server security.

What is the solution you'd like to see?

1. remove insecure services
2. deter brute force attacks with fail2ban
3. block usb ports with usbguard
4. perform system audits with lynis

Do you have additional comments?

N/A