Use markdown for some of the webpages

They're a bit easier to process than org when using Jekyll.

www/mu4e.md

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+layout: default
+permalink: /code/mu/mu4e.html
+---
+
+Starting with version 0.9.8, [mu](http://www.djcbsoftware.nl/code/mu)
+provides an emacs-based e-mail client which uses `mu` as its back-end:
+*mu4e*.
+
+Through `mu`, `mu4e` sits on top of your Maildir (which you update
+with e.g. `offlineimap` or `fetchmail`). `mu4e` is designed to enable
+super-efficient handling of e-mail; searching, reading, replying,
+moving, deleting. The overall 'feel' is a bit of a mix of `dired` and
+[Wanderlust](http://www.gohome.org/wl/).
+
+Features include:
+
+   - Fully search-based: there are no folders, only queries
+   - UI optimized for speed with quick key strokes for common actions
+   - Fully documented, with example configurations
+   - Asynchronous: heavy actions never block emacs
+   - Write rich-text e-mails using /org-mode/ (experimental)
+   - Address auto-completion based on your messages -- no need for
+     managing address books
+   - Extendable in many places using custom actions
+
+For all the details, please see the [manual](mu4e/), or
+check the screenshots below. `mu4e` is part of the normal
+[mu source package](http://code.google.com/p/mu0/downloads/list) and
+also [[https://github.com/djcb/mu][available on Github]].
+
+# Screenshots
+
+## The main view
+<img src="mu4e-1.png">
+
+## The headers view
+<img src="mu4e-2.png">
+
+## The message view
+<img src="mu4e-3.png">
+
+## The message/headers split view (0.9.8.4)
+
+<img src="mu4e-splitview.png">
+
+The message/headers split view, and speedbar support.
+
+## View message as pdf (0.9.8.4)
+
+<img src="mu4egraph.png">
+
+## License & Copyright
+
+*mu4e* was designed and implemented by Dirk-Jan C. Binnema, and is
+Free Software, licensed under the GNU GPLv3