Yii team is ready to release new yiiframework.com website. The announcement itself is interesting but since it may not be available for some time, here's most important part:
We are going to switch to the new website on March 23, 2018 in the time frame 8:00 to 12:00 UTC. During the switch, you will not be able to write comments, wikis, forum entries etc. Also the documentation may not be available. You can use http://stuff.cebe.cc/yii2docs/ to view the documentation.
We will be avilable in the Slack chat and on IRC #yii on freenode, so if you need help, get there.