Remove licensing information from

Merged Michał Kępień requested to merge michal/ into main

With most files in this repository now licensed under the BSD Zero Clause license and some other (non-copyrightable) files still licensed under the CC0-1.0 license, drop the paragraph on licensing from to avoid confusion and let SPDX tags and REUSE data speak for itself.

I missed this in !14 (merged).

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