Updated README.md Templates to Follow ESLint Markdown Rules

Created by: wrenchingdev

Updated README.md in both templates (JS/TS) to adhere to the following Markdown ESLint rules. This isn't a big change to how create-react-app works, but I'm submitting this as my eslint plugin in VS Code complains about these rules every time I open the README.md file locally.

• MD041 - First line in file should be a top level heading
• MD033 - Inline HTML
• MD034 - Bare URL used

Screenshots below show the markdown changes applied (Left) and original version (right). Note that the only visible change is the top level heading Getting Started with Create React App is now present. All other changes will display as they did before while adhering to the ESLint rules.

Side Notes:

1. No test plan has been added as this is only for the README.md file.
2. Only showing screenshot for regular JS template, as the links at the bottom are the only difference with the TS template.