Add Makefile for compiling and serving

`make` will compile the blog posts, and `make chapo` will start
the python SimpleHTTPServer on port 8000.
pelican.conf.py: Add site url

Also, use relative URLs when developing.
pelican.conf.py: Clean up blogroll and social links

Remove pre-defined example links and make the formatting a bit eas-
ier to follow.
Makefile: Can you taste it now?
Merge branch 'makefile' of https://github.com/alanorth/nairobilug.or.ke

* 'makefile' of https://github.com/alanorth/nairobilug.or.ke:
  Makefile: Can you taste it now?
  Add Makefile for compiling and serving
Makefile: Regenerate html when making chapos
Clean up fourth.md from @fredmanglis

Make headers less severe (H1 -> H3) and clean up the post to make
better use of markdown syntax so we can see what the theme is capa-
ble of (and to see how other themes look with code blocks, etc).
Merge branch 'themes' of https://github.com/alanorth/nairobilug.or.ke

* 'themes' of https://github.com/alanorth/nairobilug.or.ke:
  Clean up fourth.md from @fredmanglis
Cleanup conf
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Add crowsfoot theme

crowsfoot theme is a submodule, already forked to Nairobi LUG, added
to this repo as a submodule with:

git submodule init

To update the theme repo use:

git submodule update
Merge pull request #11 from alanorth/theme

Add crowsfoot theme
Merge pull request #12 from adamn/master

slight update to readme for mac os x