Added 404 from home page, fixed text.

Author: ahh-docker

404.md

@@ -6,11 +6,4 @@ notoc: true
 tree: false
 ---
 
-It seems the page you're looking for doesn't exist. Maybe you're on the wrong
-track, maybe you found a broken link. Who knows?
-
-Either way, here's a couple of options for you:
-
-* [Open an issue](https://github.com/docker/docker.github.io/issues/new?title=I%20found%20a%20broken%20link&body=%3CDescribe%20how%20you%20got%20there%3E)
-* [Go to back](/)
-* [Tweet us something](https://twitter.com/docker)
+![https://docs.docker.com/](/images/404-docs.png)