New pictures for documentation.

diff --git a/doc/pix/files.jpg b/doc/pix/files.jpg
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diff --git a/doc/pix/social.jpg b/doc/pix/social.jpg
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diff --git a/doc/pix/topics.jpg b/doc/pix/topics.jpg
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diff --git a/doc/pix/weekly.jpg b/doc/pix/weekly.jpg
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