Add new images

diff --git a/docs/images/contents.png b/docs/images/contents.png
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diff --git a/docs/images/index.png b/docs/images/index.png
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diff --git a/docs/images/next_g.png b/docs/images/next_g.png
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diff --git a/docs/images/prev_g.png b/docs/images/prev_g.png
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diff --git a/docs/images/up_g.png b/docs/images/up_g.png
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