pt-BR: Translate about/index.md to pt-br (#1974)
pt-BR: Translate about/index.md to pt-br (#1974)

Translated about/index.md to pt-br.
Refs: nodejs/nodejs-pt#71
phillipj/new.nodejs.org,yous/new.nodejs.org,yous/new.nodejs.org,nodejs/new.nodejs.org,phillipj/new.nodejs.org,nodejs/new.nodejs.org