replaced sequence link icons

diff --git a/docs/themes/default/images/next.gif b/docs/themes/default/images/next.gif
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diff --git a/docs/themes/default/images/next.png b/docs/themes/default/images/next.png
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diff --git a/docs/themes/default/images/previous.gif b/docs/themes/default/images/previous.gif
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index 7391bfd..0000000
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diff --git a/docs/themes/default/images/previous.png b/docs/themes/default/images/previous.png
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diff --git a/docs/themes/default/images/resume.gif b/docs/themes/default/images/resume.gif
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diff --git a/docs/themes/default/images/resume.png b/docs/themes/default/images/resume.png
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