Quickstart - first steps

These are the first steps of the GeoMapFish quickstart page. Following stuff was changed:
* At the end of `index.html`, there is a link to the tutorial page
* The tutorial page is ongoing work.

For a demo, please go to http://kalbermattenm.github.io/geomapfish_org/

I hope to find some more time in the following weeks to complete this tutorial section, but before spending more time on it, I would like to know what the other members of the geomapfish repository think about it.

Any remarks, questions, suggestions ???