doc: optimize PNGs with pngcrush

164k -> 156k

diff --git a/doc/md/images/doc-logo.png b/doc/md/images/doc-logo.png
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diff --git a/doc/md/images/edit_icon.png b/doc/md/images/edit_icon.png
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diff --git a/doc/md/images/firefoxshare.png b/doc/md/images/firefoxshare.png
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diff --git a/doc/md/images/install-shaarli.png b/doc/md/images/install-shaarli.png
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diff --git a/doc/md/images/rss-filter-1.png b/doc/md/images/rss-filter-1.png
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diff --git a/doc/md/images/rss-filter-2.png b/doc/md/images/rss-filter-2.png
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