Why website is not working?
Could you pls explain a bit more what is happening and what is the problem ? Because now, with this description, we can’t help you.
Working for me
What broswer version do you use and on which device ? Do you use browser extension which can block JS script for example ? if yes, can you disable them to see if it works ?
I tested it on lastest Chrome( Windows 10 pc) and Safari ios 11.2 device.This error independent from my browsers ,devices.
You try really the https://yunohost.org website ? (it seem that you tried to access a page which doesn’t exist.
The page https://yunohost.org/#/security is empty, can you rewrite it for future users?