fix(font): using Source Sans Pro instead of Harmonia Sans
feat(vendor): added Facebook, Pinterest, Twitter SDKs

Also added a angularJS directive that allows the use of the
facebook plugin. (Omiting it will break the plugin, as it
conflicts with angularJS.)
feat(about): restructured "about dotHIV" page

Restructured the about dotHIV section of the charity website. Work is not
yet complete, but it currently blocked.

Translation files need to be updated.

Fixed scrolling issue on about page.
fix(translations): fixed some translation keys on the home page