UI: updates breadcrumbs + font changes

* updates how text look across-site. more narrow
header/search-bar/breadcrumbs
* adds drop down button to breadcrumbs to browse throughout experiments
* removes rhs “choose experiment” pills
UI: updates "About CMS Physics" pages

* gives similar layout to “Get Started” and “About” pages
ALICE: adds other-resources/links on Research page

* ( addresess #355)
UI: dynamically populates page with experiments

* dynamically populates “Get Started” page depending on experiments on
the portal
UI: makes tab-pane populate dynamically