Mention how old all of Madaidan's guides are

[Ganwtrs]

All of Madaidan's guides were last updated 3 years ago, and there is some outdated information:

• Bromite is no longer maintained
• KeePass is recommended instead of KeePassXC, when there are security issues of KeePass like this

Other than those points, Madaidan's guides hold up pretty well. I still would like it to be a featured resource in PrivSec for the foreseeable future, it just needs a couple warnings.

[Ganwtrs]

TBH maybe it would be best to remove Madaidan’s Insecurities as a resource, especially if #418 is merged which would port and update some of his articles that don’t have an equivalent on PrivSec.dev