chore(psa): remove in memoriam for Lena per her wishes, add Lucas as NTH mod

[nopeitsnothing]

A few are simply typos and grammatical changes:

• Remove Lena's message (as per their request)
• Update chatroom rules for Matrix
• Fix various grammatical errors, spelling mistakes, etc.
• Add Lucas to mod status
• Remove in memoriam of Lena

Lena has requested (very explicitly, I might add) that we remove all of her "stupid fucking messages". This is me doing that.