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)
CMS: update of `cms-eventdisplay-files.xml`

* Fixes linking to parent datasets, adds other missing fields.
  (PR #529)
ALICE: update of `alice-vm-image.xml`

* Fixes typo, adds accelerator/experiment.  (addresses #145) (PR #550)
ALICE: update of `alice-reconstructed-data.xml`

* Adds accelerator/experiment.  (addresses #145) (PR #551)
ALICE: update of `alice-derived-datasets.xml`

* Adds DOI, adds accelerator/experiment.  (addresses #145) (PR #553)
ALICE: update of `alice-analysis-modules.xml`

* (addresses #145) (addresses #445) (PR #554)
CMS: update of `cms-csv-files.xml`

* (addresses #599) (PR #602)
LHCb: update of `lhcb-derived-datasets.xml`

* Corrects the number of events.  (PR #566)
CMS: update of `cms-primary-datasets.xml`

* Adds field 693, unifies field 256, and moves 250 to 538.
  (addresses #145) (PR #541)
CMS: update of `cms-tools-dimuon-filter.xml`

* (addresses #599) (PR #601)