Updates Dec 2020 - Jan 2021

[tima101]

• update in the book (done)

      domain: dev ? 'localhost' : process.env.COOKIE_DOMAIN,
  

• #135 (saas demo) (done)
• #136 (README as well) (done)
• move line this.setState({ content: '' }); to clear content from PostForm (done)
• "yarn": "1.22.5" (done)
• move viewport meta tag to MyApp from MyDocument (done)
• socket.io and socket.io-client version 3.0.3 - breaking changes (done)
• ESLint fixes in codebase (done)
• ESLint fixes in content (done)
• update packages (done)
• Mongoose: setOptions => lean() (done)
• move open source project to saas folder (done)
• HOC extensions, not HOCs: MyApp and MyDocument. Actual HOC: withAuth (Chapter 2, done)
• improve ctx.renderPage explanation (Chapter 2, done)
• remove api/server/env.ts file (Chapter 3, done)
• remove old comments from codebase (done)
• rewrite Jest tests with async/await (Chapter 4, done)
• comment about membersMinusCreator on the CreateDiscussionForm form (done)
• isThemeDark for DiscussionListItem and DiscussionList (done)
• Nprogress for store.currentUser.toggleTheme (done)
• two new diagrams for session and cookie, logged-out user and logged-in user (done, Chapter 5)
• clarify why we need in book-1 and book-2: request.credentials for browser-to-server and req.headers.cookie for server-to-server (done, Chapter 5)
• review Google OAuth API explanation (done, Chapter 5)
• improvements to App HOC, withAuth HOC, YourSettings page pass ctx.req to getUserApiMethod as an argument directly (done, Chapter 5 and other chapters)
• upgrade typescript to 4.1.3 (done)
• review and improve withAuth HOC explanation (done, Chapter 5)
• review Introduction chapter (done)

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Done with all planned updates.