Discord link on homepage is expired

[CryptoBeans]

A user has reported that the Discord link at the bottom of the homepage is expired. The blog post that talks about migrating to discord uses this link instead: https://discordapp.com/invite/YFeXbFZ

[Cryptoguard]

@AllienWorks

Let's use this link: https://discord.me/particl

Customized and easy to remember

[Martin Allien]

Fixed, thanks for notice :)