Simplify example usage instructions (#16678)

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

Author: NorbertLuszkiewicz

contributing.md

@@ -138,8 +138,6 @@ Deploy the example using [Vercel](https://vercel.com/now):
 
 ## How to use
 
-### Using `create-next-app`
-
 Execute [`create-next-app`](https://github.com/vercel/next.js/tree/canary/packages/create-next-app) with [npm](https://docs.npmjs.com/cli/init) or [Yarn](https://yarnpkg.com/lang/en/docs/cli/create/) to bootstrap the example:
 
 ```bash
@@ -148,24 +146,5 @@ npx create-next-app --example DIRECTORY_NAME DIRECTORY_NAME-app
 yarn create next-app --example DIRECTORY_NAME DIRECTORY_NAME-app
 ```
 
-### Download manually
-
-Download the example:
-
-```bash
-curl https://codeload.github.com/vercel/next.js/tar.gz/canary | tar -xz --strip=2 next.js-canary/examples/DIRECTORY_NAME
-cd DIRECTORY_NAME
-```
-
-Install it and run:
-
-```bash
-npm install
-npm run dev
-# or
-yarn
-yarn dev
-```
-
 Deploy it to the cloud with [Vercel](https://vercel.com/import?filter=next.js&utm_source=github&utm_medium=readme&utm_campaign=next-example) ([Documentation](https://nextjs.org/docs/deployment)).
 ````

examples/active-class-name/README.md

@@ -10,8 +10,6 @@ Deploy the example using [Vercel](https://vercel.com):
 
 ## How to use
 
-### Using `create-next-app`
-
 Execute [`create-next-app`](https://github.com/vercel/next.js/tree/canary/packages/create-next-app) with [npm](https://docs.npmjs.com/cli/init) or [Yarn](https://yarnpkg.com/lang/en/docs/cli/create/) to bootstrap the example:
 
 ```bash
@@ -20,23 +18,4 @@ npx create-next-app --example active-class-name active-class-name-app
 yarn create next-app --example active-class-name active-class-name-app
 ```
 
-### Download manually
-
-Download the example:
-
-```bash
-curl https://codeload.github.com/vercel/next.js/tar.gz/canary | tar -xz --strip=2 next.js-canary/examples/active-class-name
-cd active-class-name
-```
-
-Install it and run:
-
-```bash
-npm install
-npm run dev
-# or
-yarn
-yarn dev
-```
-
 Deploy it to the cloud with [Vercel](https://vercel.com/import?filter=next.js&utm_source=github&utm_medium=readme&utm_campaign=next-example) ([Documentation](https://nextjs.org/docs/deployment)).