add dark mode + refactor pyproject.toml

Author: SamGuay

README.md

@@ -16,7 +16,7 @@ Your friendly DICOM converter.
 [![Docker container](https://badgen.net/docker/pulls/unfmontreal/dcm2bids?icon=docker&label=pulls)](https://hub.docker.com/r/unfmontreal/dcm2bids)
 
 
-[![](https://img.shields.io/pypi/l/dcm2bids)](LICENSE.txt)
+[![](https://img.shields.io/pypi/l/dcm2bids)](/docs/LICENSE.txt)
 
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