docs: 📄 switch to MIT license, not CC-BY (#87)

# Description

Since this is sorta software, it needs a software license. I originally
used CC-BY, but looking at other copier repos, they use software
licenses.

This PR needs a quick review.

Author: lwjohnst86

LICENSE.md

@@ -1,369 +1,21 @@
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+# MIT License
+
+Copyright (c) 2025 template-data-package 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
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+
+The above copyright notice and this permission notice shall be included in all
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