docs: add tree-*.png (for tree-migrating)

diff --git a/docs/tree-layout1.png b/docs/tree-layout1.png
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diff --git a/docs/tree-layout2.png b/docs/tree-layout2.png
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diff --git a/docs/tree-shot1.png b/docs/tree-shot1.png
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index 0000000..3bbeae1
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diff --git a/docs/tree-shot2.png b/docs/tree-shot2.png
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diff --git a/docs/tree-shot3.png b/docs/tree-shot3.png
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diff --git a/docs/tree-shot4.png b/docs/tree-shot4.png
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