This updates old examples to the more universal `npx` command.

Fixes https://github.com/vercel/next.js/discussions/12103

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

* Find/replace

* Update more URLs

* More rename

* Fix remaining examples

* More updates

* Update create-next-app

* Update remaining text

* Update
Co-authored-by: NShu Uesugi <shu@chibicode.com>

* fix: with-mobx

* refactor: up link

* refactor: npm run prettier-fix

* refactor: server side render

* Updated store implementation and pages

* Updated readme
Co-authored-by: Nwangcheng <wangcheng@deepblueai.com>
Co-authored-by: NLuis Alvarez <luis@zeit.co>

* Updated with-custom-reverse-proxy

* Updated readme of with-env-from-next-config-js

* Updated the kea example

* Updated with-mobx

* Updated with-mobx readme

* Updated the with-mobx-react-lite example

* Replace zeit.co/new → zeit.co/import

* Update deployment.md

* Find/Replace "Deploy it to the cloud..."

* Find/Replace "Deploy it to the cloud..." (no colon)

* Find/Replace "Deploy it to the cloud..." for firebase

* Convert remaining ones

* Storybook deployment

* Update with-stripe-typescript

* Update contributing.md

* Remove `now`

* Update examples/with-stripe-typescript/README.md
Co-Authored-By: NLuis Alvarez D. <luis@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

* Remove Deploy To Now buttons

* Remove remaining buttons

Babel related content in README.md is updated according to the updated .babelrc

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 deploy now button to the top of all example READMEs

* Remove unnecessary whitespace changes

* Fix link

* Fix links

* Adds mobx example

* Fix coding style to match JS Standard

* Removes unecessary link

* Update README.md

* Update README.md

* Change next version from beta to ^2.0.0-beta

* Assigns the store to a local var

* Adds navigation in the example

* Removes unecessary imports

* Fix coding style to match JS Standard

* Fix Clock import