disable MPRIS2

[aw-was-here]

Summary by Sourcery

Documentation:

• Remove documentation for MPRIS2 input plugin.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request disables MPRIS2 support.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Removed MPRIS2 dependencies and documentation.	Removed MPRIS2 from the documentation. Removed the python-mpris dependency from requirements-osspecials.txt	docs/input/index.rst requirements-osspecials.txt

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