This PR was merged into the 2.7 branch.Discussion----------Shortening the setup sectionProofing the setup functionSee#72. But this does not attempt to remove any potential duplication between this page and the download page (#15).The important thing are:1) I moved permissions to its own page, but I kept the old reference in the installation chapter, because I think this is a common URL `#anchor` that people may have bookmarked or linked to.2) I shortened the demo installation details - because this is included on the demo's README.Commits-------46bc2bb Shortening the setup section

This PR was squashed before being merged into the 2.7 branch (closes#77).Discussion----------Proofing the controller chapterRemoving a lot of duplication between this and routing - which is tricky because theyare quite related topics.See#72Commits-------8afcade Proofing the controller chapter