Fix event server content

[McDouble]

Limit event server content size to like 8 GB at the most. Ban adding any new content temporarily. Jesus Christ it's over 20 GB, probably of mostly situational and useless horseshit.

[Pendred]

More than half of that is content from the main server which you already have installed. The remainder is displayed as its raw uncompressed size due to how the new workshop works. It is in fact significantly smaller on your computer. The point of the event server is to have new and different environments and things to do.