Upgrading Bootstrap and reorganizing chapters

Upgrading to Bootstrap 4 and React Bootstrap 1.4. Also, a major reorganizing of the chapters.

#509

Fixing encoding issue in new eBook

Generating new PDF to fix issue #505 (comment)

Updating to new eBook format

Using Pandoc to generate PDF and ePUB. Thanks to @pepas24 and @fwang for this PR #327.

Using CDK to configure infrastructure resources

Moving from CloudFormation to AWS CDK to configure infrastructure resources.

• Adding new chapters explaining CDK and how to use it with Serverless
• Using SST to deploy CDK alongside Serverless Framework
• Restructuring the API repo to now contain an SST and Serverless Framework app
• Updating Best Practices section with CDK as well

Adding section on error handling, upgrading React Router, and using React Context

• Adding error handling
  • Using Sentry in React
  • Using React Error Boundary
  • Adding debug messages for Lambda functions
• Upgrading React Router
• Using React Context to manage app session

New edition of Serverless Stack

• Adding a new section for Serverless best practices.
• Updating to React Hooks.
• Reorganizing chapters.
• Updating backend to Node 10.

Updating to serverless-bundle and on-demand DynamoDB

Updating to serverless-bundle and on-demand DynamoDB.

Handling API Gateway CORS errors

Update the backend repo as well - https://github.com/AnomalyInnovations/serverless-stack-demo-api/releases/tag/v3.3.3

Refactoring async Lambda functions

Updating the demo API as well - https://github.com/AnomalyInnovations/serverless-stack-demo-api/releases/tag/v3.3.2

Updating to Create React App v2

Updated the demo client as well - https://github.com/AnomalyInnovations/serverless-stack-demo-client/releases/tag/v3.3.1.