docs: clarify licensing (#894)

README.md

@@ -1,7 +1,7 @@
 <img src="https://vikunja.io/images/vikunja-logo.svg" alt="" style="display: block;width: 50%;margin: 0 auto;" width="50%"/>
 
 [![Build Status](https://drone.kolaente.de/api/badges/vikunja/vikunjaa/status.svg)](https://drone.kolaente.de/vikunja/vikunja)
-[![License: AGPL v3](https://img.shields.io/badge/License-AGPL%20v3-blue.svg)](LICENSE)
+[![License: AGPL-3.0-or-later](https://img.shields.io/badge/License-AGPL--3.0--or--later-blue.svg)](LICENSE)
 [![Install](https://img.shields.io/badge/download-v0.24.6-brightgreen.svg)](https://vikunja.io/docs/installing)
 [![Docker Pulls](https://img.shields.io/docker/pulls/vikunja/vikunja.svg)](https://hub.docker.com/r/vikunja/vikunja/)
 [![Swagger Docs](https://img.shields.io/badge/swagger-docs-brightgreen.svg)](https://try.vikunja.io/api/v1/docs)
@@ -14,14 +14,15 @@
 If Vikunja is useful to you, please consider [buying me a coffee](https://www.buymeacoffee.com/kolaente), [sponsoring me on GitHub](https://github.com/sponsors/kolaente) or buying [a sticker pack](https://vikunja.cloud/stickers).
 I'm also offering [a hosted version of Vikunja](https://vikunja.cloud/) if you want a hassle-free solution for yourself or your team.
 
-# Table of contents
+## Table of contents
 
-* [Security Reports](#security-reports)
-* [Features](#features)
-* [Docs](#docs)
-* [Roadmap](#roadmap)
-* [Contributing](#contributing)
-* [License](#license)
+- [Security Reports](#security-reports)
+- [Features](#features)
+- [Docs](#docs)
+	- [Roadmap](#roadmap)
+- [Contributing](#contributing)
+- [License](#license)
+	- [Unsplash Images](#unsplash-images)
 
 ## Security Reports
 
@@ -52,4 +53,10 @@ Please check out the contribution guidelines on [the website](https://vikunja.io
 
 ## License
 
-This project is licensed under the AGPLv3 License. See the [LICENSE](LICENSE) file for the full license text.
+Most of this repository is licensed under [AGPL‑3.0‑or‑later](LICENSE).
+The contents of [`desktop/`](desktop/) are licensed under
+[GPL‑3.0‑or‑later](desktop/LICENSE).
+
+### Unsplash Images
+
+Background images from Unsplash are distributed under the [Unsplash License](https://unsplash.com/license). The license requires giving credit to the photographer and Unsplash. See [Unsplash’s terms](https://unsplash.com/terms) for more information.