FLUID-5161: Updating build site

New manual-tests and name changes to Prefs Editor
FLUID-5161: Further restructuring of the content

Restructured how the Preference Framework manual tests and experimentations are displayed.
Merge branch 'FLUID-5161'

* FLUID-5161:
  FLUID-5161: Further restructuring of the content
  FLUID-5161: Updating build site