documentation

Pull request #2428: Feature/DEV-2543 7.0 D

Merge in WEB/documentation from feature/DEV-2543-7.0-D to release/7.0

* commit '7784789ea029129a18ff0d34e5bc29fe2b67e669':
  DEV-2543 formatting fixes, sentence clarification.
  DEV-2543 added configuration testing section.
  DEV-2543 navigation improvements, changed relevant information in the See also section, deleted network discovery section.
  DEV-2543 guide improvements.
  DEV-2543 corrected Zabbix version.
  DEV-2543 small formatting fixes.
  DEV-2543 minor fixes, added more screenshots.
  DEV-2543 updated screenshot.
  DEV-2543 formatting for correct list rendering.
  DEV-2543 various edits.
  DEV-2543 various edits.
  DEV-2543 initial draft of a guide.