Update language consistency for the About page (#647)
Update language consistency for the About page (#647)

Brings the about page in-line with our messaging of Node being a
JavaScript runtime. Also adds links to some of our new topic guides.

PR-URL: https://github.com/nodejs/nodejs.org/pull/647
nodejs/new.nodejs.org,marocchino/new.nodejs.org,phillipj/new.nodejs.org,yous/new.nodejs.org,yous/new.nodejs.org,nodejs/new.nodejs.org,phillipj/new.nodejs.org,marocchino/new.nodejs.org