fixing spelling mistakes
adding Django clearing-the-session-store link
removing extra level of hierarchy
removing unnecessary configuration
merge develop -D org: PR 799 (Linux walkthrough (rebased onto develop))
merge develop -D org: PR 824 (OME DCO)
merge develop -D org: PR 827 (Nginx doc)
merge develop -D org: PR 834 (Session engine)
merge develop -D org

Repository: openmicroscopy/ome-documentation
Already up-to-date.

Merged PRs:
  # PR 799 manics 'Linux walkthrough (rebased onto develop)'
  # PR 824 sbesson 'OME DCO'
  # PR 827 aleksandra-tarkowska 'Nginx doc'
  # PR 834 aleksandra-tarkowska 'Session engine'

Generated by OMERO-5.1-merge-push#302 (http://ci.openmicroscopy.org/job/OMERO-5.1-merge-push/302/)