* remove global npm install of create-next-app
* add npx to create-next-app command in examples
* add bash to shell snippets
* add yarn create to next-app command in examples
* fix READMEs named with lowercase
* change READMEs to use UPPERCASE
* [add] example of a progressive rendered app
* [update] remove extra blank line
* [update] fix typo
* [update] more use cases
* [update] example link
* Update README.md
* [update] next.js dependency version
* [update] fix readme typos