Update server indicators

[dennisfrank]

I sometimes don’t recognize the vertical white bar as the active server indicator. Perhaps we can make the current server and servers with unread posts more easily distinguishable from each other.

[dennisfrank]

Perhaps we can also customize the appearance of non-active server icons like this:

[class*="guildInner-"]:not(:hover) {
  filter: grayscale(100%);
}

[class*="selected-"] [class*="guildInner-"]:not(:hover) {
  filter: none;
}