docs and readme: add the new jj logo

README.md

@@ -2,6 +2,10 @@
 
 # Jujutsu—a version control system
 
+<figure>
+<img title="jj logo" src="docs/images/jj-logo.png" width=40% margin=5em>
+</figure>
+
 [![Release](https://img.shields.io/github/v/release/martinvonz/jj)](https://github.com/jj-vcs/jj/releases)
 [![Release date](https://img.shields.io/github/release-date/martinvonz/jj)](https://github.com/jj-vcs/jj/releases)
 <br/>
@@ -352,4 +356,7 @@ That said, **this is not a Google product**.
 ## License
 
 Jujutsu is available as Open Source Software, under the Apache 2.0 license. See
-[LICENSE](./LICENSE) for details about copyright and redistribution.
+[`LICENSE`](./LICENSE) for details about copyright and redistribution.
+
+The `jj` logo was contributed by J. Jennings and is licensed under a Creative
+Commons License, see [`docs/images/LICENSE`](docs/images/LICENSE).

docs/images/LICENSE

@@ -1,3 +1,3 @@
-This license applies to favicon.ico:
+This license applies to favicon-96x96.png and jj-logo.png:
 
 This work © 2025 by J. Jennings is licensed under Creative Commons Attribution 4.0 International

docs/index.md

@@ -1,5 +1,9 @@
 # Jujutsu—a version control system
 
+<figure>
+<img title="jj logo" src="images/jj-logo.png" width=40%>
+</figure>
+
 ## Welcome to `jj`'s documentation website!
 
 <!-- This only applies to the website, not to the GitHub interface -->