Merge pull request #842 from sbesson/sidebartoc_order

Insert OMERO sidebar template after page TOC sidebar
Reformatting VA docs to make less intimidating!
clarification suggested by @manics
mention only relevant web servers
sysadmin web deployment cleanup
review of web deployment section, including:

 - splitting sysadmin and developers OMERO.web deployment
 - adjusting instructions for sysadmin
 - adjusting nginx instructions for developers
updating paths
adding static url
adding timeout adjustment
removing extra level of hierarchy
removing unnecessary configuration
fixing all inline comments from sbesson
exposing production deployment as the main option
reverting client_body_temp_path as needed
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)
merge dev_5_0 -D org: PR 819 (12311 auto memory docs)