add a link to a tip

diff --git a/doc/tips/convert_blogger_blogs_to_ikiwiki.mdwn b/doc/tips/convert_blogger_blogs_to_ikiwiki.mdwn
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+Daniel Burrows
+[explains](http://algebraicthunk.net/~dburrows/blog/entry/howto-convert-your-blogger-or-blogspot-blog-to-ikiwiki/)
+how to convert your Blogger/BlogSpot blog to ikiwiki.