docs: suppressing sphinx warnings about stray files

docs/args/draw.rst

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 fill_color
   default: ``'#0000'`` (fully transparent)
 

docs/args/expansion.rst

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 All of these options support arrays and singleton expansion (except for **range**). See :doc:`/arrays` for deeper explanation.

docs/args/layout.rst

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 layout
   default: ``nil``
 

docs/args/output_dir.rst

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 dir
   default: ``_output``
 

docs/args/range.rst

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 range
   default: ``:all``
 

docs/args/transform.rst

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 angle
   default: ``0``
 

docs/args/trim.rst

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 trim
   default: ``0``
 

docs/args/wh.rst

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 width
   default: ``:deck`` (the width of the deck)
 

docs/args/xy.rst

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 x
   default: ``0``