ACLs on whole pages

Created by: dtu-compute

Depends on #168.

Right now the following is broken

####### begin:only Main
A secret only `Main` can read.
####### end:only

and I suppose when going with Jekyll/Asciidoc, we want to compile whole pages, and have ACL on whole pages to makes things easier?

Once we know how the Asciidoc(tor) parser works, we should see how it can easiest be implemented in the website.

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