Add hero image and heading to README.md (#967)

README.md

@@ -7,10 +7,11 @@
 [![Twitter](https://img.shields.io/twitter/follow/getumbrel?style=social)](https://twitter.com/getumbrel)
 [![Reddit](https://img.shields.io/reddit/subreddit-subscribers/getumbrel?label=Subscribe%20%2Fr%2Fgetumbrel&style=social)](https://reddit.com/r/getumbrel)
 
-# ☂️ Umbrel
+# ☂️ Umbrel — a personal server for everyone
-
 > ⚠️ Umbrel is currently in beta and is not considered secure. Please see [SECURITY.md](SECURITY.md) for more details.
 
+[![Umbrel](https://static.getumbrel.com/github/umbrel-github-hero.png)](https://getumbrel.com)
+
 This is the master repository of Umbrel and contains the framework for orchestration of all containerized services running on [Umbrel OS](https://github.com/getumbrel/umbrel-os).
 
 It is platform and architecture-agnostic, thus can be used to directly spin up instances of Umbrel without installing the [Umbrel OS](https://github.com/getumbrel/umbrel-os) since all orchestrated services use multi-architecture Docker images.