Add gitrepo post announcing the gitrepo template.

diff --git a/posts/gitrepo.mdwn b/posts/gitrepo.mdwn
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+I've added a [[templates/gitrepo]] template to make it easy to link to
+my [[Git]] projects with [[rel-vcs]] links.  It's based on ikiwiki's
+[gitbranch][] template.
+
+It was a bit annoying to get the template into renderable Markdown
+because the `<TMPL_...>` tags are not explanded when the gitrepo page
+is being rendered in its own right.  The solution was to use the
+[htmlscrubber][] plugin with
+
+    htmlscrubber_skip => "!templates/*",
+
+and to also exclude the unscrubbed page from the [[tags/git]] tag
+inlines.  I can't use the htmlscrubber plugin everywhere because it
+scrubs out my [[MathML]] (see [[mdwn_itex]]).
+
+[gitbranch]: http://ikiwiki.info/templates/gitbranch/
+[htmlscrubber]: http://ikiwiki.info/plugins/htmlscrubber/
+
+[[!tag tags/blogging]]
+[[!tag tags/git]]