UI: fixes external link in "About CMS physics"
UI: adds apple-touch-icon + favicon

* (addresses #745)
UI: removes right-side icon on external links
UI: updates "About" page

* adds a “technology used” section with invenio, cernvm, eos
* adds cernvm img
* (addresses #702)
repo: cleans repo from unneeded images

* (addresses #454)
UI: updates with optimised LHCb logo

* (addresses #454)
templates: updates - fixes url section