chore: 📄 switch from MIT to CC-BY license (#32)

## Description

The wrong license was created from the template. Switched to the correct
one.

## Reviewer Focus

This PR needs a quick review.

LICENSE.md

@@ -1,23 +1,9 @@
-# MIT License
+# License
 
-Copyright (c) 2023 Luke Johnston
+Copyright (c) 2024 Authors
 
-Permission is hereby granted, free of charge, to any person obtaining a
-copy of this software and associated documentation files (the
-"Software"), to deal in the Software without restriction, including
-without limitation the rights to use, copy, modify, merge, publish,
-distribute, sublicense, and/or sell copies of the Software, and to
-permit persons to whom the Software is furnished to do so, subject to
-the following conditions:
-
-The above copyright notice and this permission notice shall be included
-in all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
-OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
-IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
-CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
-TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
-SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+<a rel="license" href="https://creativecommons.org/licenses/by/4.0/"><img src="https://i.creativecommons.org/l/by/4.0/88x31.png" alt="Creative Commons License" style="border-width:0"/></a>
 
+The course material and code is licensed under the [Creative Commons
+Attribution 4.0 International
+License](https://creativecommons.org/licenses/by/4.0/).