CMS: example DAS metadata in JSON

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

This is work in progress until I have all metadata examples and descriptions included and ping Pamfilos for the upload and indexing.
Update extendedmetadataexamples.xml
Merge branch 'pu-updates' of https://github.com/pamfilos/open-data.cern.ch into pamfilos-pu-updates
Update extendedmetadataexamples.xml
docs: more generous VM RAM/CPU size

* Updates example VM parameters to use more RAM and more CPU.

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
global: open-data.cern.ch -> opendata.cern.ch

* Switches to the new canonical URL `opendata.cern.ch`.  (closes #62)

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
fixtures: initial working release

* Fixes loading of fixtures.  (see #10 #57)

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
CMS: initial release of Tools collection

* Introduces "CMS Tools" collection.  (addresses #58)

* Adds CMS VM image record.  (closes #47)

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
CMS: primary and reduced dataset record example

* Adds MARCXML record examples for CMS primary and reduced dataset
  records.  (addresses #34)
CMS: new DAS metadata for primary datasets

* More CMS DAS metadata for primary datasets.  (addresses #34)
CMS: Reduced datasets become Derived datasets

* Renames "CMS Reduced Dataset" to "CMS Derived Dataset".
  (closes #80)

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
CMS: extended record examples

* Enriches record examples for CMS primary dataset, CMS derived dataset,
  CMS tools code.  (addresses #34)
collection_list: show depending on edu/research
records: record template by collection
homepage: cms/alice btns + "about" + responsive

* CMS/ALICE buttons added for experiment separation
* “ABOUT” link on header
* change a bit more greyish colour on bg-icons
collection_list: FIX collection name after change