Add chapters on FB login and user management

Added new chapters on Facebook login with AWS Amplify and mapping Identity Id with User Pool Id. Also, added a new series of chapters on forgot password, change email and password.

Added section on Serverless architecture

Adding a new section on organizing Serverless applications. Outlining how to use CloudFormation cross-stack references to link multiple Serverless services.

The sample repo for this section can be found here - https://github.com/AnomalyInnovations/serverless-stack-demo-mono-api

Update to use UsernameAttributes

v3.1

Update to use UsernameAttributes

Adding Part II

v3.0

Adding Part II

Updating to use starter & Node v8.10

v2.2

Updating to use starter

Updating to Webpack 4

The sample project code repos are also tagged with this version.

• API

Amplify Update

The sample project code repos are also tagged with this version.

• Client

Using specific Bootstrap css version

v1.2.5

Using specific Bootstrap css version

Updating to React 16

The sample project code repos are also tagged with this version.

• Client

Updating to babel-env preset

The sample project code repos are also tagged with this version.

• API