Repository: create-react-app
Issue: Basic instructions didn't work with previous global install
Labels: stale,needs triage,issue: bug report


### Describe the bug
I followed the directions on "Getting Started".

They mentioned: 
```
npm uninstall -g create-react-app
```
Which I did. When I then resumed the tutorial, I got an error.

### Did you try recovering your dependencies?
N/A

### Which terms did you search for in User Guide?

I was at the start page.

### Environment

[C:\c\React]node --version
v12.5.0

[C:\c\React]npx --version
6.14.6

C:\c\React]npx create-react-app --info
Command failed: C:\"Program Files"\nodejs\node.exe "C:\Users\JohnQPublic\AppData\Roaming\npm\node_modules\npm\bin\npm-cli.js" config get cache --parseable
internal/modules/cjs/loader.js:628
    throw err;
    ^

Error: Cannot find module 'C:\c\temp\"C:\Users\JohnDGwinner\AppData\Roaming\npm\node_modules\npm\bin\npm-cli.js"'
    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:625:15)
    at Function.Module._load (internal/modules/cjs/loader.js:527:27)
    at Function.Module.runMain (internal/modules/cjs/loader.js:839:10)
    at internal/main/run_main_module.js:17:11 {
  code: 'MODULE_NOT_FOUND',
  requireStack: []
}

### Steps to reproduce

1. Go to the "Getting Started Page"
2. Read the recommendation.
3. Follow recommendation:  `npm uninstall -g create-react-app`
4. Continue the getting started steps:
4. `npx create-react-app cra-test`

Error - I gather, as I'd just uninstalled it of course.

### Expected behavior

The "getting Started" should actually work, and not require prior knowledge.

### Actual behavior
```
C:\c\React]npm uninstall -g create-react-app
removed 91 packages in 2.156s

[C:\c\React]npx create-react-app cra-test --template typescript
Command failed: C:\"Program Files"\nodejs\node.exe "C:\Users\JohnQPublic\AppData\Roaming\npm\node_modules\npm\bin\npm-cli.js" config get cache --parseable
internal/modules/cjs/loader.js:628
    throw err;
    ^

Error: Cannot find module 'C:\c\React\"C:\Users\JohnQPublic\AppData\Roaming\npm\node_modules\npm\bin\npm-cli.js"'
    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:625:15)
    at Function.Module._load (internal/modules/cjs/loader.js:527:27)
    at Function.Module.runMain (internal/modules/cjs/loader.js:839:10)
    at internal/main/run_main_module.js:17:11 {
  code: 'MODULE_NOT_FOUND',
  requireStack: []
}
```

### Reproducible demo

As Given Above

### A Fix

If you've previously installed create-react-app globally via npm install -g create-react-app, we recommend you uninstall the package using npm uninstall -g create-react-app to ensure that npx always uses the latest version; **then npm install create-react-app.**

Emphasis mine. If you do this, then it works; of course, it dumps node_modules all over your parent directory. I'd far rather just do an update to the global objects, so I'm not sure about the recommendation. 

For beginners though - it should just work as typed exactly.

Working version:

```
C:\c\React]npm install create-react-app
npm WARN saveError ENOENT: no such file or directory, open 'C:\c\React\package.json'
npm notice created a lockfile as package-lock.json. You should commit this file.
npm WARN enoent ENOENT: no such file or directory, open 'C:\c\React\package.json'
npm WARN React No description
npm WARN React No repository field.
npm WARN React No README data
npm WARN React No license field.

+ create-react-app@3.4.1
added 97 packages from 45 contributors and audited 97 packages in 7.062s

6 packages are looking for funding
  run `npm fund` for details

found 0 vulnerabilities


[C:\c\React]npx create-react-app cra-test --template typescript

Creating a new React app in C:\c\React\

Installing packages. This might take a couple of minutes.
Installing react, react-dom, and react-scripts with cra-template-typescript...
 

.... etc
```