documentation

Pull request #2790: Feature/DEV-4305 7.3 D

Merge in WEB/documentation from feature/DEV-4305-7.3-D to release/7.4

* commit 'c06cfcf55b42bdf97e486e0e2b273c9cb05c79f1': (25 commits)
  DEV-4305 updated a section.
  DEV-4305 minor corrections.
  DEV-4305 updated a link.
  DEV-4305 added a link to FAQ.
  DEV-4305 minor improvements.
  DEV-4305 removed redundant information and screenshots.
  DEV-4305 added more links.
  DEV-4305 formatting improvements.
  DEV-4305 fixed a comment block.
  DEV-4305 formatting, paraphrasing.
  DEV-4305 improvements, restructuring, formatting.
  DEV-4305 fixes and rearrangements, formatting improvements.
  DEV-4305 updates to upgrade and backups tabs, formatting and small improvements.
  DEV-4305 pages clarifications.
  DEV-4305 various improvements and clarifications.
  DEV-4305 added crosslinks, improved introductory page.
  DEV-4305 added an introduction page, formatting improvements.
  DEV-4305 wording and formatting improvements.
  DEV-4305 various improvements.
  DEV-4305 reformatting.
  ...