cleaning up tutorials section

Hi,

As previously discussed I've created a branch to remove the tutorials  
section and redistribute the content to new or existing sections.

I haven't created a pull request yet as I have to go fix a bunch of  
broken links and also move some content that has recently been added  
to the tutorials section.

You can see the diffs here.

https://github.com/collective/collective.developermanual/compare/master...djay





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