adding y-table and y-tensioner, which replace y bearing holders and y belt holder

diff --git a/doc/images/new-mdf-mounting.png b/doc/images/new-mdf-mounting.png
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diff --git a/doc/parts-visual/y-belt-tensioner.jpg b/doc/parts-visual/y-belt-tensioner.jpg
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diff --git a/doc/parts-visual/y-table.jpg b/doc/parts-visual/y-table.jpg
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diff --git a/stl/y-tensioner.stl b/stl/y-tensioner.stl
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diff --git a/stl/ytable-8mm.stl b/stl/ytable-8mm.stl
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