chore: add emoji fallback font support for web

README.md

@@ -107,6 +107,10 @@ runs with crash reporting disabled until you configure it. See
 
 ## License
 
+The web build bundles a subset of [Noto Color Emoji](https://github.com/googlefonts/noto-emoji),
+licensed under the SIL Open Font License 1.1
+([data/resources/licenses/NotoColorEmoji-OFL.txt](./data/resources/licenses/NotoColorEmoji-OFL.txt)).
+
 This project is licensed under the Apache License 2.0. See the [LICENSE](LICENSE) file for details.
 
 ```