docs: add Front-end section

Cognito Custom Resources runtime upgrade: PR aws-samples#14 from wing…

…tonbrito

aws does not support nodejs6.10 anymore. Upgrading to next version, 8.10

Episode 2: Implements the Catalog service including client-side code …

…generation, GraphQL schema and infrastructure

Episode 0: Bare minimum front-end and no project initialized

Front-end with mock data; no back-end nor auth

Merge pull request aws-samples#3 from heitorlessa/twitch

EP2 - Catalog Service