Update server-icon mapping

php/assets/server-icons.php

@@ -16,10 +16,14 @@
 	function server_icon(CommunityServer $server, string $size): ?string {
 		global $SERVER_ICON_MAPPING;
 		$hostname = $server->get_hostname();
-		if (!isset($SERVER_ICON_MAPPING[$hostname])) {
+		$pubkey = $server->get_pubkey();
+		if (isset($SERVER_ICON_MAPPING[$hostname])) {
+			$room_token = $SERVER_ICON_MAPPING[$hostname];
+		} else if (isset($SERVER_ICON_MAPPING[$pubkey])) {
+			$room_token = $SERVER_ICON_MAPPING[$pubkey];
+		} else {
 			return "";
 		}
-		$room_token = $SERVER_ICON_MAPPING[$hostname];
 		$room = $server->get_room_by_token($room_token);
 		if (!$room) {
 			log_warning("Room $room_token on $hostname does not exist, cannot be used as icon.");

php/servers/known-servers.php

@@ -146,7 +146,9 @@
 	$SERVER_ICON_MAPPING = [
 		"open.getsession.org" => "session",
 		"sog.caliban.org" => "privacy",
-		"session.xanthus.uk" => "midnight-madness",
+		"c992da3901c59074ce15614ca8bf02b82c9b543e6ba9783cccd0d4e21f621f01" => "midnight-madness",
+		"a3d56b901a39ba1bb4f6f8ab9dc9bb9343135a99f7d3d0ddc15d9ae2ddcefb55" => "esperanto",
+		"sogs.cosmicnation.co" => "cosmicnation",
 	];
 
 	/**