feature: support SPDX file tags
Is your feature request related to a problem? Please describe.
Specifying license and copyright in source files in always an interesting challenge, more so if you want to consume that information elsewhere through automation without ambiguity.
Describe the solution you'd like
Currently shellman specifies \license and \copyright for this information. It would be useful if it (and by extension mkdocs-shell also recognised the associated SPDX file tags SPDX-license-identifier: and SPDX-FileCopyrightText: .
Describe alternatives you've considered
Duplicating both and / or omitting the shellman equivalent.
Additional context
SPDX File Tags reference: https://spdx.github.io/spdx-spec/v2.3/file-tags/
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