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
UI: changes CMS text for Research description

* amends CMS description text until parallel-big-file-download is safe
* (addresses #377)
* (closes #587)
ALICE: updates ALICE Learning Resources page

* (closes #384)
collections: updates collections template

* updates breadcrumbs for parent-current collection
* html escaping for collection description
* lightens font-weight in collection desc links
UI: adds Learning Resources "action"-box to homepg
records: adds "Dataset" to record page & brief

* (addresses #514)
overlay: removes unused hmtl page
UI: updates "VM" pages for across site unification
UI: fixes "tabs" for all experiments
UI: fixes space between list items in "About" page

* (closes #594)
URL: experiment specific URL for visualise pages

* ‘visualise/events’ => ‘visualise/events/CMS’
* ‘visualise/histograms’ => ‘visualise/histograms/CMS’
* (closes #598)