UI: makes homepage "action"-buttons more clickable
UI: updated breadcrumbs styling

* fixes alignment
* fixes “font-weight” to smh lighter
UI: updates macro for experiment "action"-box

* changes box-styling to be more unified across portal
UI: adds "action"-boxes to ALICE, LHCb

* adds “action”-boxes to education pages for ALICE, LHCb
* connects VM, GetStarted pages with education
* (addresses #573)
UI: changes intro text wording on the home page

* (closes #581)
overlay: cleaning code from alternative homepages