UI: homepage changes + link update

* (close #135)
content: added text to "Learn more/Resources" page

* (addresses #126)
UI: updated "404" to redirect to the homepage
testsuite: CMS Tools collection fix

* Fixes collection indicator in two CMS Tools records.
  (addresses #126)

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