mdhelp: This is a major overhaul of the documentation.

mdhelp: This is a major overhaul of the documentation.

* I've removed unnecessary sections in many of the docs describing how to
add, edit and delete entries. We're just repeating ourselves, the
general web interface guide covers most situations anyway.

* Clean up the documentation image directory. This took a while as things
were all over the place, I've deleted unused files and put all images in
separate folders..

* I've tried to add little bits here and there - still lots more things
need improving but hopefully this is a start!