Unpin and remake Mastodon pinned post regarding community

[Ganwtrs]

This pinned post is outdated, so it should be unpinned and a new, updated post can be made. It can go somewhat like the updated chat platforms section on the website

[Ganwtrs]

Here's my "PR":

Consider joining the GrapheneOS community in our official forum and chat rooms!

Forum: https://discuss.grapheneos.org/

GrapheneOS has official chat rooms on Discord and Matrix. Discord provides a better experience and is far more active than Matrix. We no longer bridge our chat rooms across platforms so they are entirely separate.

Discord: https://discord.com/invite/grapheneos

Matrix: https://matrix.to/#/#community:grapheneos.org