UI: fixes displaying for <ol> in Firefox

* (closes #375)
news: updates news page

* removes link from “author”
* removes ratings ( “+7” pill )
* (closes #284)
footer: harmonise page footer across site

* removes reproduction of top-nav-menu in footer
* makes footer in homepage and other pages look identical
* adds transparent background in testimonials
* (closes #360)
UI: updates testimonials responsiveness

* hides “testimonials” area when window/screen height is small
UI: fixes overflow in collection boxes
research: adds research specific description

* adds specific experiment description in “Research Pages”
* (addresses #361)
UI: breadcrumbs generalization

* use of “>” (#addresses 316)
installation: new local FFT file cache

* Adds `populate-fft-file-cache.sh` helper build script useful to
  pre-download all files used in FFTs.  (closes #350)

* Amends installation instructions on how to use local FFT file cache.

* Amends all XML input files accordingly.

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>