DAR-1532 Fix for not updated title tag content on Special:Chat page

Basically we talked about it with @themech and decided to resign from keeping room name and its topic in redis -- we couldn't find a reason why it had been kept there. In Special:Chat controller we changed the way ` $this->roomName` and `$this->roomTopic` values are get from. Also, a small refactoring was done in server api, storage and `NodeApiController` which reflects the changes connected to not keeping room name and topic in redis.