Split advanced configuration into sections

OME-DCO-1.1-Signed-off-by: Sebastien Besson <seb.besson@gmail.com> (github: sbesson)
Rename dn-configuration section

OME-DCO-1.1-Signed-off-by: Sebastien Besson <seb.besson@gmail.com> (github: sbesson)
List advanced configuration sections in the main page

OME-DCO-1.1-Signed-off-by: Sebastien Besson <seb.besson@gmail.com> (github: sbesson)
merge dev_5_0 -D org: PR 860 (move %time% template expansion term to only user-owned)
merge dev_5_0 -D org: PR 862 (DropBox note)
merge dev_5_0 -D org: PR 863 (OMERO.server properties: documentation template)
merge dev_5_0 -D org

Repository: openmicroscopy/ome-documentation
Updating ed60a3e..8004c06
Merged PRs (fast-forward):
  # PR 852 hflynn 'Tidy Upgrade page incl. Paris requests for 5.0.3'
  # PR 819 joshmoore '12311 auto memory docs'

Merged PRs:
  # PR 860 mtbc 'move %time% template expansion term to only user-owned'
  # PR 862 ximenesuk 'DropBox note'
  # PR 863 sbesson 'OMERO.server properties: documentation template'
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