Co-authored-by: NJoe Haddad <joe.haddad@zeit.co>

* npx create → npm init

* Fix inconsistent instructions

* Update amp-first

* Update with-graphql-react

* with-firebase-cloud-messaging

* Update with-higher-order-component

* change create-next-app url

* Update create-next-app instruction

* Update instructions to use npm instead of npx

* Move "the idea behind the example" to top

* Rename

* Rename

* Update contributing.md with a README template

Preferably this installation wouldn't be necessary, but in lieu of a fix...

#4751

* Examples: clarify language around Yarn create & npx

* add missing READMEs and create-next-app usage

* suggest people tag jthegedus in firebase related issues

* add yarn alt instructions

* cerebraljs example readme & fixes

* 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

* examples: add create-next-app

* fix with-typescript readme

* Add Electron usage example

* Remove the deploy part

* Only allow GET request to our HTTP server

* Only allow request from an electron app (checking the user agent)

* Add warning about the local HTTP server

* Update package.json

* Update example to use Next.js v3

* Added required package.json fields with placeholders

* Use next:// file protocol to open internal built files

* Create next.config.js

* Update set-menu.js

* Update example to merge it with electron-next-skeleton ideas