Insert OMERO sidebar template after page TOC sidebar

OME-DCO-1.1-Signed-off-by: Sebastien Besson <seb.besson@gmail.com> (github: sbesson)
Re-working OMERO sysadmin index page
Merge pull request #842 from sbesson/sidebartoc_order

Insert OMERO sidebar template after page TOC sidebar
Reformatting VA docs to make less intimidating!
Merge pull request #847 from hflynn/VM-doc

Reformatting VA docs to make them less scary
Merge pull request #844 from hflynn/sysadmin-reorg

Re-working OMERO sysadmin index page
adding HTTP response header to the windows section
updating screenshot
Merge pull request #851 from aleksandra-tarkowska/rebased/dev_5_0/IIS_compatibility_mode

adding HTTP response header (rebased onto dev_5_0)