Archive/deprecate repo

[SharkWipf]

The last commit made to this repo was in 2017 and there have been outstanding security issues since 2016 (see i.e. #35).

This project is in the official repos of many Linux distributions today, but is clearly no longer maintained and is no longer safe to use.

The right thing to do here would probably be to either officially deprecate/archive the project or hand maintenance over to someone else directly, since seemingly not even distribution maintainers are aware of the state of the project.

[cecilkorik]

Reverting to version 5.10 seems to solve some of the more glaring issues, but I agree this project needs active maintenance. It is a potentially hazardous tool and it's a bit worrying how many major distros this has found its way into in this state, I am surprised there is not more scrutiny.