ATLAS: Higgs Challenge 2014 software record update

* Updates ATLAS Higgs Challenge 2014 software record with link to GitHub
  repository.  Archives latest "v0.0" version.  (addresses #660)

* Removes second software record, since there will be only one software
  repository for now.

* Improves indentation of the MARCXML file.

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
UI: creates page for "Atlas Higgs Challenge 2014"

* (addresses #724)
templates: creates macro for home exp-dropdown

* creates macro for experiment dropdown button on the homepage
UI: fixes in collection-boxes
templates: updates "Disclaimer" text

* displays license text if “license” field exists, else displays
default ‘CC0’ license
* (closes #732)
templates: adds LaTex displaying through MathJax
ATLAS: updates "Higgs Challenge 2014" xml file

* adds “$” for MathJax escaping
templates: updates ordering and adds 500 field

* updates order of ‘Dataset Semantics’ between file and urls
* displays ‘500’ fields
UI: adds route for '/glossary'

* (addresses #215)
glossary: updates anchors in json file

* (addresses #215)
UI: adds "Glossary" page

* (addresses #215)
UI: adds link to the "Glossary" from Education

* creates a 4th “action” box in the education section for the glossary
glossary: sorts json objects alphabetical in file
UI: updates to "glossary" page styling

* removes content menu
* fixes visibility of anchor when hovering a term